From 2f99ce37e5380c8e53fb3515cc2bc5d48bd3d7fd Mon Sep 17 00:00:00 2001
From: Kristóf Marussy <kris7topher@gmail.com>
Date: Fri, 11 Jan 2019 15:41:57 +0100
Subject: Build with Eclipse 2018.12, generated files change

---
 .../dslreasoner/domains/alloyexamples/.gitignore   |   8 +
 .../domains/alloyexamples/ContentInNotLive.java    | 741 +++++++++++++++++++++
 .../domains/alloyexamples/DirectSupertype.java     | 692 +++++++++++++++++++
 .../dslreasoner/domains/alloyexamples/Live.java    | 730 ++++++++++++++++++++
 .../domains/alloyexamples/LoopInInheritence.java   | 548 +++++++++++++++
 .../alloyexamples/NonSymmetricOpposite.java        | 707 ++++++++++++++++++++
 .../domains/alloyexamples/Opposite.java            | 693 +++++++++++++++++++
 .../alloyexamples/OppositeDifferentClass.java      | 577 ++++++++++++++++
 .../domains/alloyexamples/PatternContent.java      | 693 +++++++++++++++++++
 9 files changed, 5389 insertions(+)
 create mode 100644 Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/ContentInNotLive.java
 create mode 100644 Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/DirectSupertype.java
 create mode 100644 Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Live.java
 create mode 100644 Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/LoopInInheritence.java
 create mode 100644 Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/NonSymmetricOpposite.java
 create mode 100644 Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Opposite.java
 create mode 100644 Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/OppositeDifferentClass.java
 create mode 100644 Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/PatternContent.java

(limited to 'Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples')

diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/.gitignore b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/.gitignore
index 9d608403..52338993 100644
--- a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/.gitignore
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/.gitignore
@@ -34,3 +34,11 @@
 /OppositeMatcher.java
 /PatternContentMatch.java
 /PatternContentMatcher.java
+/.ContentInNotLive.java._trace
+/.DirectSupertype.java._trace
+/.Live.java._trace
+/.LoopInInheritence.java._trace
+/.NonSymmetricOpposite.java._trace
+/.Opposite.java._trace
+/.OppositeDifferentClass.java._trace
+/.PatternContent.java._trace
diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/ContentInNotLive.java b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/ContentInNotLive.java
new file mode 100644
index 00000000..ffdc1a69
--- /dev/null
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/ContentInNotLive.java
@@ -0,0 +1,741 @@
+/**
+ * Generated from platform:/resource/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/patterns/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/FileSystem.vql
+ */
+package hu.bme.mit.inf.dslreasoner.domains.alloyexamples;
+
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.Dir;
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject;
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Live;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.emf.types.EStructuralFeatureInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.PAnnotation;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.ParameterReference;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.Equality;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.NegativePatternCall;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         {@literal @}Constraint(key={child}, severity="error", message="error")
+ *         pattern contentInNotLive(parent : Dir, child: FSObject) {
+ *         	Dir.contents(parent,child);
+ *         	neg find live(_,parent);
+ *         } or {
+ *         	Dir.contents(parent,child);
+ *         	neg find live(_,child);
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class ContentInNotLive extends BaseGeneratedEMFQuerySpecification<ContentInNotLive.Matcher> {
+  /**
+   * Pattern-specific match representation of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.contentInNotLive pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private Dir fParent;
+    
+    private FSObject fChild;
+    
+    private static List<String> parameterNames = makeImmutableList("parent", "child");
+    
+    private Match(final Dir pParent, final FSObject pChild) {
+      this.fParent = pParent;
+      this.fChild = pChild;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("parent".equals(parameterName)) return this.fParent;
+      if ("child".equals(parameterName)) return this.fChild;
+      return null;
+    }
+    
+    public Dir getParent() {
+      return this.fParent;
+    }
+    
+    public FSObject getChild() {
+      return this.fChild;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("parent".equals(parameterName) ) {
+          this.fParent = (Dir) newValue;
+          return true;
+      }
+      if ("child".equals(parameterName) ) {
+          this.fChild = (FSObject) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setParent(final Dir pParent) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fParent = pParent;
+    }
+    
+    public void setChild(final FSObject pChild) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fChild = pChild;
+    }
+    
+    @Override
+    public String patternName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.contentInNotLive";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return ContentInNotLive.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fParent, fChild};
+    }
+    
+    @Override
+    public ContentInNotLive.Match toImmutable() {
+      return isMutable() ? newMatch(fParent, fChild) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"parent\"=" + prettyPrintValue(fParent) + ", ");
+      result.append("\"child\"=" + prettyPrintValue(fChild));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fParent, fChild);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof ContentInNotLive.Match)) {
+          ContentInNotLive.Match other = (ContentInNotLive.Match) obj;
+          return Objects.equals(fParent, other.fParent) && Objects.equals(fChild, other.fChild);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public ContentInNotLive specification() {
+      return ContentInNotLive.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static ContentInNotLive.Match newEmptyMatch() {
+      return new Mutable(null, null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static ContentInNotLive.Match newMutableMatch(final Dir pParent, final FSObject pChild) {
+      return new Mutable(pParent, pChild);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static ContentInNotLive.Match newMatch(final Dir pParent, final FSObject pChild) {
+      return new Immutable(pParent, pChild);
+    }
+    
+    private static final class Mutable extends ContentInNotLive.Match {
+      Mutable(final Dir pParent, final FSObject pChild) {
+        super(pParent, pChild);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends ContentInNotLive.Match {
+      Immutable(final Dir pParent, final FSObject pChild) {
+        super(pParent, pChild);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.contentInNotLive pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * {@literal @}Constraint(key={child}, severity="error", message="error")
+   * pattern contentInNotLive(parent : Dir, child: FSObject) {
+   * 	Dir.contents(parent,child);
+   * 	neg find live(_,parent);
+   * } or {
+   * 	Dir.contents(parent,child);
+   * 	neg find live(_,child);
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see ContentInNotLive
+   * 
+   */
+  public static class Matcher extends BaseMatcher<ContentInNotLive.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static ContentInNotLive.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static ContentInNotLive.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_PARENT = 0;
+    
+    private static final int POSITION_CHILD = 1;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(ContentInNotLive.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<ContentInNotLive.Match> getAllMatches(final Dir pParent, final FSObject pChild) {
+      return rawStreamAllMatches(new Object[]{pParent, pChild}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<ContentInNotLive.Match> streamAllMatches(final Dir pParent, final FSObject pChild) {
+      return rawStreamAllMatches(new Object[]{pParent, pChild});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<ContentInNotLive.Match> getOneArbitraryMatch(final Dir pParent, final FSObject pChild) {
+      return rawGetOneArbitraryMatch(new Object[]{pParent, pChild});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final Dir pParent, final FSObject pChild) {
+      return rawHasMatch(new Object[]{pParent, pChild});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final Dir pParent, final FSObject pChild) {
+      return rawCountMatches(new Object[]{pParent, pChild});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final Dir pParent, final FSObject pChild, final Consumer<? super ContentInNotLive.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pParent, pChild}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pParent the fixed value of pattern parameter parent, or null if not bound.
+     * @param pChild the fixed value of pattern parameter child, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public ContentInNotLive.Match newMatch(final Dir pParent, final FSObject pChild) {
+      return ContentInNotLive.Match.newMatch(pParent, pChild);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for parent.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<Dir> rawStreamAllValuesOfparent(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_PARENT, parameters).map(Dir.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for parent.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Dir> getAllValuesOfparent() {
+      return rawStreamAllValuesOfparent(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for parent.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Dir> streamAllValuesOfparent() {
+      return rawStreamAllValuesOfparent(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for parent.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Dir> streamAllValuesOfparent(final ContentInNotLive.Match partialMatch) {
+      return rawStreamAllValuesOfparent(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for parent.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Dir> streamAllValuesOfparent(final FSObject pChild) {
+      return rawStreamAllValuesOfparent(new Object[]{null, pChild});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for parent.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Dir> getAllValuesOfparent(final ContentInNotLive.Match partialMatch) {
+      return rawStreamAllValuesOfparent(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for parent.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Dir> getAllValuesOfparent(final FSObject pChild) {
+      return rawStreamAllValuesOfparent(new Object[]{null, pChild}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for child.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<FSObject> rawStreamAllValuesOfchild(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_CHILD, parameters).map(FSObject.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for child.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfchild() {
+      return rawStreamAllValuesOfchild(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for child.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfchild() {
+      return rawStreamAllValuesOfchild(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for child.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfchild(final ContentInNotLive.Match partialMatch) {
+      return rawStreamAllValuesOfchild(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for child.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfchild(final Dir pParent) {
+      return rawStreamAllValuesOfchild(new Object[]{pParent, null});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for child.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfchild(final ContentInNotLive.Match partialMatch) {
+      return rawStreamAllValuesOfchild(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for child.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfchild(final Dir pParent) {
+      return rawStreamAllValuesOfchild(new Object[]{pParent, null}).collect(Collectors.toSet());
+    }
+    
+    @Override
+    protected ContentInNotLive.Match tupleToMatch(final Tuple t) {
+      try {
+          return ContentInNotLive.Match.newMatch((Dir) t.get(POSITION_PARENT), (FSObject) t.get(POSITION_CHILD));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected ContentInNotLive.Match arrayToMatch(final Object[] match) {
+      try {
+          return ContentInNotLive.Match.newMatch((Dir) match[POSITION_PARENT], (FSObject) match[POSITION_CHILD]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected ContentInNotLive.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return ContentInNotLive.Match.newMutableMatch((Dir) match[POSITION_PARENT], (FSObject) match[POSITION_CHILD]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<ContentInNotLive.Matcher> querySpecification() {
+      return ContentInNotLive.instance();
+    }
+  }
+  
+  private ContentInNotLive() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static ContentInNotLive instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected ContentInNotLive.Matcher instantiate(final ViatraQueryEngine engine) {
+    return ContentInNotLive.Matcher.on(engine);
+  }
+  
+  @Override
+  public ContentInNotLive.Matcher instantiate() {
+    return ContentInNotLive.Matcher.create();
+  }
+  
+  @Override
+  public ContentInNotLive.Match newEmptyMatch() {
+    return ContentInNotLive.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public ContentInNotLive.Match newMatch(final Object... parameters) {
+    return ContentInNotLive.Match.newMatch((hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.Dir) parameters[0], (hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject) parameters[1]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.ContentInNotLive (visibility: PUBLIC, simpleName: ContentInNotLive, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.ContentInNotLive, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.ContentInNotLive (visibility: PUBLIC, simpleName: ContentInNotLive, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.ContentInNotLive, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final ContentInNotLive INSTANCE = new ContentInNotLive();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private static final Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private static final ContentInNotLive.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_parent = new PParameter("parent", "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.Dir", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("FS", "Dir")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_child = new PParameter("child", "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("FS", "FSObject")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_parent, parameter_child);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.contentInNotLive";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("parent","child");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_parent = body.getOrCreateVariableByName("parent");
+          PVariable var_child = body.getOrCreateVariableByName("child");
+          PVariable var___0_ = body.getOrCreateVariableByName("_<0>");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_parent), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "Dir")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_child), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_parent, parameter_parent),
+             new ExportedParameter(body, var_child, parameter_child)
+          ));
+          // 	Dir.contents(parent,child)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_parent), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "Dir")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_parent, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("FS", "Dir", "contents")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          new Equality(body, var__virtual_0_, var_child);
+          // 	neg find live(_,parent)
+          new NegativePatternCall(body, Tuples.flatTupleOf(var___0_, var_parent), Live.instance().getInternalQueryRepresentation());
+          bodies.add(body);
+      }
+      {
+          PBody body = new PBody(this);
+          PVariable var_parent = body.getOrCreateVariableByName("parent");
+          PVariable var_child = body.getOrCreateVariableByName("child");
+          PVariable var___0_ = body.getOrCreateVariableByName("_<0>");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_parent), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "Dir")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_child), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_parent, parameter_parent),
+             new ExportedParameter(body, var_child, parameter_child)
+          ));
+          // 	Dir.contents(parent,child)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_parent), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "Dir")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_parent, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("FS", "Dir", "contents")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          new Equality(body, var__virtual_0_, var_child);
+          // 	neg find live(_,child)
+          new NegativePatternCall(body, Tuples.flatTupleOf(var___0_, var_child), Live.instance().getInternalQueryRepresentation());
+          bodies.add(body);
+      }
+      {
+          PAnnotation annotation = new PAnnotation("Constraint");
+          annotation.addAttribute("key", Arrays.asList(new Object[] {
+                              new ParameterReference("child")
+                              }));
+          annotation.addAttribute("severity", "error");
+          annotation.addAttribute("message", "error");
+          addAnnotation(annotation);
+      }
+      return bodies;
+    }
+  }
+}
diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/DirectSupertype.java b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/DirectSupertype.java
new file mode 100644
index 00000000..03020a7c
--- /dev/null
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/DirectSupertype.java
@@ -0,0 +1,692 @@
+/**
+ * Generated from platform:/resource/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/patterns/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Ecore.vql
+ */
+package hu.bme.mit.inf.dslreasoner.domains.alloyexamples;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.emf.types.EStructuralFeatureInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.Equality;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         pattern directSupertype(a: EClass, b:EClass) {
+ *         	EClass.eSuperTypes(a,b);
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class DirectSupertype extends BaseGeneratedEMFQuerySpecification<DirectSupertype.Matcher> {
+  /**
+   * Pattern-specific match representation of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.directSupertype pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private EClass fA;
+    
+    private EClass fB;
+    
+    private static List<String> parameterNames = makeImmutableList("a", "b");
+    
+    private Match(final EClass pA, final EClass pB) {
+      this.fA = pA;
+      this.fB = pB;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("a".equals(parameterName)) return this.fA;
+      if ("b".equals(parameterName)) return this.fB;
+      return null;
+    }
+    
+    public EClass getA() {
+      return this.fA;
+    }
+    
+    public EClass getB() {
+      return this.fB;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("a".equals(parameterName) ) {
+          this.fA = (EClass) newValue;
+          return true;
+      }
+      if ("b".equals(parameterName) ) {
+          this.fB = (EClass) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setA(final EClass pA) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fA = pA;
+    }
+    
+    public void setB(final EClass pB) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fB = pB;
+    }
+    
+    @Override
+    public String patternName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.directSupertype";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return DirectSupertype.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fA, fB};
+    }
+    
+    @Override
+    public DirectSupertype.Match toImmutable() {
+      return isMutable() ? newMatch(fA, fB) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"a\"=" + prettyPrintValue(fA) + ", ");
+      result.append("\"b\"=" + prettyPrintValue(fB));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fA, fB);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof DirectSupertype.Match)) {
+          DirectSupertype.Match other = (DirectSupertype.Match) obj;
+          return Objects.equals(fA, other.fA) && Objects.equals(fB, other.fB);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public DirectSupertype specification() {
+      return DirectSupertype.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static DirectSupertype.Match newEmptyMatch() {
+      return new Mutable(null, null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static DirectSupertype.Match newMutableMatch(final EClass pA, final EClass pB) {
+      return new Mutable(pA, pB);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static DirectSupertype.Match newMatch(final EClass pA, final EClass pB) {
+      return new Immutable(pA, pB);
+    }
+    
+    private static final class Mutable extends DirectSupertype.Match {
+      Mutable(final EClass pA, final EClass pB) {
+        super(pA, pB);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends DirectSupertype.Match {
+      Immutable(final EClass pA, final EClass pB) {
+        super(pA, pB);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.directSupertype pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * pattern directSupertype(a: EClass, b:EClass) {
+   * 	EClass.eSuperTypes(a,b);
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see DirectSupertype
+   * 
+   */
+  public static class Matcher extends BaseMatcher<DirectSupertype.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static DirectSupertype.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static DirectSupertype.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_A = 0;
+    
+    private static final int POSITION_B = 1;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(DirectSupertype.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<DirectSupertype.Match> getAllMatches(final EClass pA, final EClass pB) {
+      return rawStreamAllMatches(new Object[]{pA, pB}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<DirectSupertype.Match> streamAllMatches(final EClass pA, final EClass pB) {
+      return rawStreamAllMatches(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<DirectSupertype.Match> getOneArbitraryMatch(final EClass pA, final EClass pB) {
+      return rawGetOneArbitraryMatch(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final EClass pA, final EClass pB) {
+      return rawHasMatch(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final EClass pA, final EClass pB) {
+      return rawCountMatches(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final EClass pA, final EClass pB, final Consumer<? super DirectSupertype.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pA, pB}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public DirectSupertype.Match newMatch(final EClass pA, final EClass pB) {
+      return DirectSupertype.Match.newMatch(pA, pB);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<EClass> rawStreamAllValuesOfa(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_A, parameters).map(EClass.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EClass> getAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EClass> streamAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EClass> streamAllValuesOfa(final DirectSupertype.Match partialMatch) {
+      return rawStreamAllValuesOfa(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EClass> streamAllValuesOfa(final EClass pB) {
+      return rawStreamAllValuesOfa(new Object[]{null, pB});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EClass> getAllValuesOfa(final DirectSupertype.Match partialMatch) {
+      return rawStreamAllValuesOfa(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EClass> getAllValuesOfa(final EClass pB) {
+      return rawStreamAllValuesOfa(new Object[]{null, pB}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<EClass> rawStreamAllValuesOfb(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_B, parameters).map(EClass.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EClass> getAllValuesOfb() {
+      return rawStreamAllValuesOfb(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EClass> streamAllValuesOfb() {
+      return rawStreamAllValuesOfb(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EClass> streamAllValuesOfb(final DirectSupertype.Match partialMatch) {
+      return rawStreamAllValuesOfb(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EClass> streamAllValuesOfb(final EClass pA) {
+      return rawStreamAllValuesOfb(new Object[]{pA, null});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EClass> getAllValuesOfb(final DirectSupertype.Match partialMatch) {
+      return rawStreamAllValuesOfb(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EClass> getAllValuesOfb(final EClass pA) {
+      return rawStreamAllValuesOfb(new Object[]{pA, null}).collect(Collectors.toSet());
+    }
+    
+    @Override
+    protected DirectSupertype.Match tupleToMatch(final Tuple t) {
+      try {
+          return DirectSupertype.Match.newMatch((EClass) t.get(POSITION_A), (EClass) t.get(POSITION_B));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected DirectSupertype.Match arrayToMatch(final Object[] match) {
+      try {
+          return DirectSupertype.Match.newMatch((EClass) match[POSITION_A], (EClass) match[POSITION_B]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected DirectSupertype.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return DirectSupertype.Match.newMutableMatch((EClass) match[POSITION_A], (EClass) match[POSITION_B]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<DirectSupertype.Matcher> querySpecification() {
+      return DirectSupertype.instance();
+    }
+  }
+  
+  private DirectSupertype() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static DirectSupertype instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected DirectSupertype.Matcher instantiate(final ViatraQueryEngine engine) {
+    return DirectSupertype.Matcher.on(engine);
+  }
+  
+  @Override
+  public DirectSupertype.Matcher instantiate() {
+    return DirectSupertype.Matcher.create();
+  }
+  
+  @Override
+  public DirectSupertype.Match newEmptyMatch() {
+    return DirectSupertype.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public DirectSupertype.Match newMatch(final Object... parameters) {
+    return DirectSupertype.Match.newMatch((org.eclipse.emf.ecore.EClass) parameters[0], (org.eclipse.emf.ecore.EClass) parameters[1]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.DirectSupertype (visibility: PUBLIC, simpleName: DirectSupertype, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.DirectSupertype, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.DirectSupertype (visibility: PUBLIC, simpleName: DirectSupertype, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.DirectSupertype, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final DirectSupertype INSTANCE = new DirectSupertype();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private static final Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private static final DirectSupertype.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_a = new PParameter("a", "org.eclipse.emf.ecore.EClass", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("http://www.eclipse.org/emf/2002/Ecore", "EClass")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_b = new PParameter("b", "org.eclipse.emf.ecore.EClass", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("http://www.eclipse.org/emf/2002/Ecore", "EClass")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_a, parameter_b);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.directSupertype";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("a","b");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_a = body.getOrCreateVariableByName("a");
+          PVariable var_b = body.getOrCreateVariableByName("b");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EClass")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_b), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EClass")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_a, parameter_a),
+             new ExportedParameter(body, var_b, parameter_b)
+          ));
+          // 	EClass.eSuperTypes(a,b)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EClass")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("http://www.eclipse.org/emf/2002/Ecore", "EClass", "eSuperTypes")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EClass")));
+          new Equality(body, var__virtual_0_, var_b);
+          bodies.add(body);
+      }
+      return bodies;
+    }
+  }
+}
diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Live.java b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Live.java
new file mode 100644
index 00000000..ae0f0c58
--- /dev/null
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Live.java
@@ -0,0 +1,730 @@
+/**
+ * Generated from platform:/resource/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/patterns/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/FileSystem.vql
+ */
+package hu.bme.mit.inf.dslreasoner.domains.alloyexamples;
+
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject;
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FileSystem;
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.PatternContent;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.emf.types.EStructuralFeatureInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.PAnnotation;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.Equality;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.BinaryTransitiveClosure;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         {@literal @}QueryBasedFeature
+ *         pattern live(this: FileSystem, l: FSObject) {
+ *         	FileSystem.root(this,l);
+ *         } or {
+ *         	FileSystem.root(this,root);
+ *         	find patternContent+(root,l);
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class Live extends BaseGeneratedEMFQuerySpecification<Live.Matcher> {
+  /**
+   * Pattern-specific match representation of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.live pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private FileSystem fThis;
+    
+    private FSObject fL;
+    
+    private static List<String> parameterNames = makeImmutableList("this", "l");
+    
+    private Match(final FileSystem pThis, final FSObject pL) {
+      this.fThis = pThis;
+      this.fL = pL;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("this".equals(parameterName)) return this.fThis;
+      if ("l".equals(parameterName)) return this.fL;
+      return null;
+    }
+    
+    public FileSystem getThis() {
+      return this.fThis;
+    }
+    
+    public FSObject getL() {
+      return this.fL;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("this".equals(parameterName) ) {
+          this.fThis = (FileSystem) newValue;
+          return true;
+      }
+      if ("l".equals(parameterName) ) {
+          this.fL = (FSObject) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setThis(final FileSystem pThis) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fThis = pThis;
+    }
+    
+    public void setL(final FSObject pL) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fL = pL;
+    }
+    
+    @Override
+    public String patternName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.live";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return Live.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fThis, fL};
+    }
+    
+    @Override
+    public Live.Match toImmutable() {
+      return isMutable() ? newMatch(fThis, fL) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"this\"=" + prettyPrintValue(fThis) + ", ");
+      result.append("\"l\"=" + prettyPrintValue(fL));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fThis, fL);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof Live.Match)) {
+          Live.Match other = (Live.Match) obj;
+          return Objects.equals(fThis, other.fThis) && Objects.equals(fL, other.fL);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public Live specification() {
+      return Live.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static Live.Match newEmptyMatch() {
+      return new Mutable(null, null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static Live.Match newMutableMatch(final FileSystem pThis, final FSObject pL) {
+      return new Mutable(pThis, pL);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static Live.Match newMatch(final FileSystem pThis, final FSObject pL) {
+      return new Immutable(pThis, pL);
+    }
+    
+    private static final class Mutable extends Live.Match {
+      Mutable(final FileSystem pThis, final FSObject pL) {
+        super(pThis, pL);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends Live.Match {
+      Immutable(final FileSystem pThis, final FSObject pL) {
+        super(pThis, pL);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.live pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * {@literal @}QueryBasedFeature
+   * pattern live(this: FileSystem, l: FSObject) {
+   * 	FileSystem.root(this,l);
+   * } or {
+   * 	FileSystem.root(this,root);
+   * 	find patternContent+(root,l);
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see Live
+   * 
+   */
+  public static class Matcher extends BaseMatcher<Live.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static Live.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static Live.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_THIS = 0;
+    
+    private static final int POSITION_L = 1;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(Live.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<Live.Match> getAllMatches(final FileSystem pThis, final FSObject pL) {
+      return rawStreamAllMatches(new Object[]{pThis, pL}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<Live.Match> streamAllMatches(final FileSystem pThis, final FSObject pL) {
+      return rawStreamAllMatches(new Object[]{pThis, pL});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<Live.Match> getOneArbitraryMatch(final FileSystem pThis, final FSObject pL) {
+      return rawGetOneArbitraryMatch(new Object[]{pThis, pL});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final FileSystem pThis, final FSObject pL) {
+      return rawHasMatch(new Object[]{pThis, pL});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final FileSystem pThis, final FSObject pL) {
+      return rawCountMatches(new Object[]{pThis, pL});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final FileSystem pThis, final FSObject pL, final Consumer<? super Live.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pThis, pL}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pThis the fixed value of pattern parameter this, or null if not bound.
+     * @param pL the fixed value of pattern parameter l, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public Live.Match newMatch(final FileSystem pThis, final FSObject pL) {
+      return Live.Match.newMatch(pThis, pL);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for this.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<FileSystem> rawStreamAllValuesOfthis(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_THIS, parameters).map(FileSystem.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for this.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FileSystem> getAllValuesOfthis() {
+      return rawStreamAllValuesOfthis(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for this.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FileSystem> streamAllValuesOfthis() {
+      return rawStreamAllValuesOfthis(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for this.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FileSystem> streamAllValuesOfthis(final Live.Match partialMatch) {
+      return rawStreamAllValuesOfthis(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for this.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FileSystem> streamAllValuesOfthis(final FSObject pL) {
+      return rawStreamAllValuesOfthis(new Object[]{null, pL});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for this.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FileSystem> getAllValuesOfthis(final Live.Match partialMatch) {
+      return rawStreamAllValuesOfthis(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for this.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FileSystem> getAllValuesOfthis(final FSObject pL) {
+      return rawStreamAllValuesOfthis(new Object[]{null, pL}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for l.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<FSObject> rawStreamAllValuesOfl(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_L, parameters).map(FSObject.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for l.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfl() {
+      return rawStreamAllValuesOfl(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for l.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfl() {
+      return rawStreamAllValuesOfl(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for l.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfl(final Live.Match partialMatch) {
+      return rawStreamAllValuesOfl(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for l.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfl(final FileSystem pThis) {
+      return rawStreamAllValuesOfl(new Object[]{pThis, null});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for l.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfl(final Live.Match partialMatch) {
+      return rawStreamAllValuesOfl(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for l.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfl(final FileSystem pThis) {
+      return rawStreamAllValuesOfl(new Object[]{pThis, null}).collect(Collectors.toSet());
+    }
+    
+    @Override
+    protected Live.Match tupleToMatch(final Tuple t) {
+      try {
+          return Live.Match.newMatch((FileSystem) t.get(POSITION_THIS), (FSObject) t.get(POSITION_L));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected Live.Match arrayToMatch(final Object[] match) {
+      try {
+          return Live.Match.newMatch((FileSystem) match[POSITION_THIS], (FSObject) match[POSITION_L]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected Live.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return Live.Match.newMutableMatch((FileSystem) match[POSITION_THIS], (FSObject) match[POSITION_L]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<Live.Matcher> querySpecification() {
+      return Live.instance();
+    }
+  }
+  
+  private Live() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static Live instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected Live.Matcher instantiate(final ViatraQueryEngine engine) {
+    return Live.Matcher.on(engine);
+  }
+  
+  @Override
+  public Live.Matcher instantiate() {
+    return Live.Matcher.create();
+  }
+  
+  @Override
+  public Live.Match newEmptyMatch() {
+    return Live.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public Live.Match newMatch(final Object... parameters) {
+    return Live.Match.newMatch((hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FileSystem) parameters[0], (hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject) parameters[1]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Live (visibility: PUBLIC, simpleName: Live, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Live, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Live (visibility: PUBLIC, simpleName: Live, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Live, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final Live INSTANCE = new Live();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private static final Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private static final Live.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_this = new PParameter("this", "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FileSystem", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("FS", "FileSystem")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_l = new PParameter("l", "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("FS", "FSObject")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_this, parameter_l);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.live";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("this","l");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_this = body.getOrCreateVariableByName("this");
+          PVariable var_l = body.getOrCreateVariableByName("l");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_this), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FileSystem")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_l), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_this, parameter_this),
+             new ExportedParameter(body, var_l, parameter_l)
+          ));
+          // 	FileSystem.root(this,l)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_this), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FileSystem")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_this, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("FS", "FileSystem", "root")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "Dir")));
+          new Equality(body, var__virtual_0_, var_l);
+          bodies.add(body);
+      }
+      {
+          PBody body = new PBody(this);
+          PVariable var_this = body.getOrCreateVariableByName("this");
+          PVariable var_l = body.getOrCreateVariableByName("l");
+          PVariable var_root = body.getOrCreateVariableByName("root");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_this), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FileSystem")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_l), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_this, parameter_this),
+             new ExportedParameter(body, var_l, parameter_l)
+          ));
+          // 	FileSystem.root(this,root)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_this), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FileSystem")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_this, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("FS", "FileSystem", "root")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "Dir")));
+          new Equality(body, var__virtual_0_, var_root);
+          // 	find patternContent+(root,l)
+          new BinaryTransitiveClosure(body, Tuples.flatTupleOf(var_root, var_l), PatternContent.instance().getInternalQueryRepresentation());
+          bodies.add(body);
+      }
+      {
+          PAnnotation annotation = new PAnnotation("QueryBasedFeature");
+          addAnnotation(annotation);
+      }
+      return bodies;
+    }
+  }
+}
diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/LoopInInheritence.java b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/LoopInInheritence.java
new file mode 100644
index 00000000..51bd83a9
--- /dev/null
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/LoopInInheritence.java
@@ -0,0 +1,548 @@
+/**
+ * Generated from platform:/resource/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/patterns/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Ecore.vql
+ */
+package hu.bme.mit.inf.dslreasoner.domains.alloyexamples;
+
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.DirectSupertype;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.PAnnotation;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.ParameterReference;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.BinaryTransitiveClosure;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         {@literal @}Constraint(key={a}, severity="error", message="error")
+ *         pattern loopInInheritence(a: EClass) {
+ *         	find directSupertype+(a,a);
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class LoopInInheritence extends BaseGeneratedEMFQuerySpecification<LoopInInheritence.Matcher> {
+  /**
+   * Pattern-specific match representation of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.loopInInheritence pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private EClass fA;
+    
+    private static List<String> parameterNames = makeImmutableList("a");
+    
+    private Match(final EClass pA) {
+      this.fA = pA;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("a".equals(parameterName)) return this.fA;
+      return null;
+    }
+    
+    public EClass getA() {
+      return this.fA;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("a".equals(parameterName) ) {
+          this.fA = (EClass) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setA(final EClass pA) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fA = pA;
+    }
+    
+    @Override
+    public String patternName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.loopInInheritence";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return LoopInInheritence.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fA};
+    }
+    
+    @Override
+    public LoopInInheritence.Match toImmutable() {
+      return isMutable() ? newMatch(fA) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"a\"=" + prettyPrintValue(fA));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fA);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof LoopInInheritence.Match)) {
+          LoopInInheritence.Match other = (LoopInInheritence.Match) obj;
+          return Objects.equals(fA, other.fA);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public LoopInInheritence specification() {
+      return LoopInInheritence.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static LoopInInheritence.Match newEmptyMatch() {
+      return new Mutable(null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static LoopInInheritence.Match newMutableMatch(final EClass pA) {
+      return new Mutable(pA);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static LoopInInheritence.Match newMatch(final EClass pA) {
+      return new Immutable(pA);
+    }
+    
+    private static final class Mutable extends LoopInInheritence.Match {
+      Mutable(final EClass pA) {
+        super(pA);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends LoopInInheritence.Match {
+      Immutable(final EClass pA) {
+        super(pA);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.loopInInheritence pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * {@literal @}Constraint(key={a}, severity="error", message="error")
+   * pattern loopInInheritence(a: EClass) {
+   * 	find directSupertype+(a,a);
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see LoopInInheritence
+   * 
+   */
+  public static class Matcher extends BaseMatcher<LoopInInheritence.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static LoopInInheritence.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static LoopInInheritence.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_A = 0;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(LoopInInheritence.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<LoopInInheritence.Match> getAllMatches(final EClass pA) {
+      return rawStreamAllMatches(new Object[]{pA}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<LoopInInheritence.Match> streamAllMatches(final EClass pA) {
+      return rawStreamAllMatches(new Object[]{pA});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<LoopInInheritence.Match> getOneArbitraryMatch(final EClass pA) {
+      return rawGetOneArbitraryMatch(new Object[]{pA});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final EClass pA) {
+      return rawHasMatch(new Object[]{pA});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final EClass pA) {
+      return rawCountMatches(new Object[]{pA});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final EClass pA, final Consumer<? super LoopInInheritence.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pA}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public LoopInInheritence.Match newMatch(final EClass pA) {
+      return LoopInInheritence.Match.newMatch(pA);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<EClass> rawStreamAllValuesOfa(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_A, parameters).map(EClass.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EClass> getAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EClass> streamAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray());
+    }
+    
+    @Override
+    protected LoopInInheritence.Match tupleToMatch(final Tuple t) {
+      try {
+          return LoopInInheritence.Match.newMatch((EClass) t.get(POSITION_A));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected LoopInInheritence.Match arrayToMatch(final Object[] match) {
+      try {
+          return LoopInInheritence.Match.newMatch((EClass) match[POSITION_A]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected LoopInInheritence.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return LoopInInheritence.Match.newMutableMatch((EClass) match[POSITION_A]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<LoopInInheritence.Matcher> querySpecification() {
+      return LoopInInheritence.instance();
+    }
+  }
+  
+  private LoopInInheritence() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static LoopInInheritence instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected LoopInInheritence.Matcher instantiate(final ViatraQueryEngine engine) {
+    return LoopInInheritence.Matcher.on(engine);
+  }
+  
+  @Override
+  public LoopInInheritence.Matcher instantiate() {
+    return LoopInInheritence.Matcher.create();
+  }
+  
+  @Override
+  public LoopInInheritence.Match newEmptyMatch() {
+    return LoopInInheritence.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public LoopInInheritence.Match newMatch(final Object... parameters) {
+    return LoopInInheritence.Match.newMatch((org.eclipse.emf.ecore.EClass) parameters[0]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.LoopInInheritence (visibility: PUBLIC, simpleName: LoopInInheritence, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.LoopInInheritence, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.LoopInInheritence (visibility: PUBLIC, simpleName: LoopInInheritence, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.LoopInInheritence, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final LoopInInheritence INSTANCE = new LoopInInheritence();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private static final Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private static final LoopInInheritence.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_a = new PParameter("a", "org.eclipse.emf.ecore.EClass", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("http://www.eclipse.org/emf/2002/Ecore", "EClass")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_a);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.loopInInheritence";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("a");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_a = body.getOrCreateVariableByName("a");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EClass")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_a, parameter_a)
+          ));
+          // 	find directSupertype+(a,a)
+          new BinaryTransitiveClosure(body, Tuples.flatTupleOf(var_a, var_a), DirectSupertype.instance().getInternalQueryRepresentation());
+          bodies.add(body);
+      }
+      {
+          PAnnotation annotation = new PAnnotation("Constraint");
+          annotation.addAttribute("key", Arrays.asList(new Object[] {
+                              new ParameterReference("a")
+                              }));
+          annotation.addAttribute("severity", "error");
+          annotation.addAttribute("message", "error");
+          addAnnotation(annotation);
+      }
+      return bodies;
+    }
+  }
+}
diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/NonSymmetricOpposite.java b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/NonSymmetricOpposite.java
new file mode 100644
index 00000000..bd2833a7
--- /dev/null
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/NonSymmetricOpposite.java
@@ -0,0 +1,707 @@
+/**
+ * Generated from platform:/resource/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/patterns/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Ecore.vql
+ */
+package hu.bme.mit.inf.dslreasoner.domains.alloyexamples;
+
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Opposite;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.PAnnotation;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.ParameterReference;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.NegativePatternCall;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.PositivePatternCall;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         {@literal @}Constraint(key={a}, severity="error", message="error")
+ *         pattern nonSymmetricOpposite(a:EReference, b:EReference) {
+ *         	find opposite(a,b);
+ *         	neg find opposite(b,a);
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class NonSymmetricOpposite extends BaseGeneratedEMFQuerySpecification<NonSymmetricOpposite.Matcher> {
+  /**
+   * Pattern-specific match representation of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.nonSymmetricOpposite pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private EReference fA;
+    
+    private EReference fB;
+    
+    private static List<String> parameterNames = makeImmutableList("a", "b");
+    
+    private Match(final EReference pA, final EReference pB) {
+      this.fA = pA;
+      this.fB = pB;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("a".equals(parameterName)) return this.fA;
+      if ("b".equals(parameterName)) return this.fB;
+      return null;
+    }
+    
+    public EReference getA() {
+      return this.fA;
+    }
+    
+    public EReference getB() {
+      return this.fB;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("a".equals(parameterName) ) {
+          this.fA = (EReference) newValue;
+          return true;
+      }
+      if ("b".equals(parameterName) ) {
+          this.fB = (EReference) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setA(final EReference pA) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fA = pA;
+    }
+    
+    public void setB(final EReference pB) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fB = pB;
+    }
+    
+    @Override
+    public String patternName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.nonSymmetricOpposite";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return NonSymmetricOpposite.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fA, fB};
+    }
+    
+    @Override
+    public NonSymmetricOpposite.Match toImmutable() {
+      return isMutable() ? newMatch(fA, fB) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"a\"=" + prettyPrintValue(fA) + ", ");
+      result.append("\"b\"=" + prettyPrintValue(fB));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fA, fB);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof NonSymmetricOpposite.Match)) {
+          NonSymmetricOpposite.Match other = (NonSymmetricOpposite.Match) obj;
+          return Objects.equals(fA, other.fA) && Objects.equals(fB, other.fB);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public NonSymmetricOpposite specification() {
+      return NonSymmetricOpposite.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static NonSymmetricOpposite.Match newEmptyMatch() {
+      return new Mutable(null, null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static NonSymmetricOpposite.Match newMutableMatch(final EReference pA, final EReference pB) {
+      return new Mutable(pA, pB);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static NonSymmetricOpposite.Match newMatch(final EReference pA, final EReference pB) {
+      return new Immutable(pA, pB);
+    }
+    
+    private static final class Mutable extends NonSymmetricOpposite.Match {
+      Mutable(final EReference pA, final EReference pB) {
+        super(pA, pB);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends NonSymmetricOpposite.Match {
+      Immutable(final EReference pA, final EReference pB) {
+        super(pA, pB);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.nonSymmetricOpposite pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * {@literal @}Constraint(key={a}, severity="error", message="error")
+   * pattern nonSymmetricOpposite(a:EReference, b:EReference) {
+   * 	find opposite(a,b);
+   * 	neg find opposite(b,a);
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see NonSymmetricOpposite
+   * 
+   */
+  public static class Matcher extends BaseMatcher<NonSymmetricOpposite.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static NonSymmetricOpposite.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static NonSymmetricOpposite.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_A = 0;
+    
+    private static final int POSITION_B = 1;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(NonSymmetricOpposite.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<NonSymmetricOpposite.Match> getAllMatches(final EReference pA, final EReference pB) {
+      return rawStreamAllMatches(new Object[]{pA, pB}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<NonSymmetricOpposite.Match> streamAllMatches(final EReference pA, final EReference pB) {
+      return rawStreamAllMatches(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<NonSymmetricOpposite.Match> getOneArbitraryMatch(final EReference pA, final EReference pB) {
+      return rawGetOneArbitraryMatch(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final EReference pA, final EReference pB) {
+      return rawHasMatch(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final EReference pA, final EReference pB) {
+      return rawCountMatches(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final EReference pA, final EReference pB, final Consumer<? super NonSymmetricOpposite.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pA, pB}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public NonSymmetricOpposite.Match newMatch(final EReference pA, final EReference pB) {
+      return NonSymmetricOpposite.Match.newMatch(pA, pB);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<EReference> rawStreamAllValuesOfa(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_A, parameters).map(EReference.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfa(final NonSymmetricOpposite.Match partialMatch) {
+      return rawStreamAllValuesOfa(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfa(final EReference pB) {
+      return rawStreamAllValuesOfa(new Object[]{null, pB});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfa(final NonSymmetricOpposite.Match partialMatch) {
+      return rawStreamAllValuesOfa(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfa(final EReference pB) {
+      return rawStreamAllValuesOfa(new Object[]{null, pB}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<EReference> rawStreamAllValuesOfb(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_B, parameters).map(EReference.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfb() {
+      return rawStreamAllValuesOfb(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfb() {
+      return rawStreamAllValuesOfb(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfb(final NonSymmetricOpposite.Match partialMatch) {
+      return rawStreamAllValuesOfb(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfb(final EReference pA) {
+      return rawStreamAllValuesOfb(new Object[]{pA, null});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfb(final NonSymmetricOpposite.Match partialMatch) {
+      return rawStreamAllValuesOfb(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfb(final EReference pA) {
+      return rawStreamAllValuesOfb(new Object[]{pA, null}).collect(Collectors.toSet());
+    }
+    
+    @Override
+    protected NonSymmetricOpposite.Match tupleToMatch(final Tuple t) {
+      try {
+          return NonSymmetricOpposite.Match.newMatch((EReference) t.get(POSITION_A), (EReference) t.get(POSITION_B));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected NonSymmetricOpposite.Match arrayToMatch(final Object[] match) {
+      try {
+          return NonSymmetricOpposite.Match.newMatch((EReference) match[POSITION_A], (EReference) match[POSITION_B]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected NonSymmetricOpposite.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return NonSymmetricOpposite.Match.newMutableMatch((EReference) match[POSITION_A], (EReference) match[POSITION_B]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<NonSymmetricOpposite.Matcher> querySpecification() {
+      return NonSymmetricOpposite.instance();
+    }
+  }
+  
+  private NonSymmetricOpposite() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static NonSymmetricOpposite instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected NonSymmetricOpposite.Matcher instantiate(final ViatraQueryEngine engine) {
+    return NonSymmetricOpposite.Matcher.on(engine);
+  }
+  
+  @Override
+  public NonSymmetricOpposite.Matcher instantiate() {
+    return NonSymmetricOpposite.Matcher.create();
+  }
+  
+  @Override
+  public NonSymmetricOpposite.Match newEmptyMatch() {
+    return NonSymmetricOpposite.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public NonSymmetricOpposite.Match newMatch(final Object... parameters) {
+    return NonSymmetricOpposite.Match.newMatch((org.eclipse.emf.ecore.EReference) parameters[0], (org.eclipse.emf.ecore.EReference) parameters[1]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.NonSymmetricOpposite (visibility: PUBLIC, simpleName: NonSymmetricOpposite, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.NonSymmetricOpposite, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.NonSymmetricOpposite (visibility: PUBLIC, simpleName: NonSymmetricOpposite, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.NonSymmetricOpposite, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final NonSymmetricOpposite INSTANCE = new NonSymmetricOpposite();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private static final Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private static final NonSymmetricOpposite.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_a = new PParameter("a", "org.eclipse.emf.ecore.EReference", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("http://www.eclipse.org/emf/2002/Ecore", "EReference")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_b = new PParameter("b", "org.eclipse.emf.ecore.EReference", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("http://www.eclipse.org/emf/2002/Ecore", "EReference")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_a, parameter_b);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.nonSymmetricOpposite";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("a","b");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_a = body.getOrCreateVariableByName("a");
+          PVariable var_b = body.getOrCreateVariableByName("b");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_b), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_a, parameter_a),
+             new ExportedParameter(body, var_b, parameter_b)
+          ));
+          // 	find opposite(a,b)
+          new PositivePatternCall(body, Tuples.flatTupleOf(var_a, var_b), Opposite.instance().getInternalQueryRepresentation());
+          // 	neg find opposite(b,a)
+          new NegativePatternCall(body, Tuples.flatTupleOf(var_b, var_a), Opposite.instance().getInternalQueryRepresentation());
+          bodies.add(body);
+      }
+      {
+          PAnnotation annotation = new PAnnotation("Constraint");
+          annotation.addAttribute("key", Arrays.asList(new Object[] {
+                              new ParameterReference("a")
+                              }));
+          annotation.addAttribute("severity", "error");
+          annotation.addAttribute("message", "error");
+          addAnnotation(annotation);
+      }
+      return bodies;
+    }
+  }
+}
diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Opposite.java b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Opposite.java
new file mode 100644
index 00000000..c4832370
--- /dev/null
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Opposite.java
@@ -0,0 +1,693 @@
+/**
+ * Generated from platform:/resource/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/patterns/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Ecore.vql
+ */
+package hu.bme.mit.inf.dslreasoner.domains.alloyexamples;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.emf.types.EStructuralFeatureInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.Equality;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         pattern opposite(a:EReference, b: EReference) {
+ *         	EReference.eOpposite(a,b);
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class Opposite extends BaseGeneratedEMFQuerySpecification<Opposite.Matcher> {
+  /**
+   * Pattern-specific match representation of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.opposite pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private EReference fA;
+    
+    private EReference fB;
+    
+    private static List<String> parameterNames = makeImmutableList("a", "b");
+    
+    private Match(final EReference pA, final EReference pB) {
+      this.fA = pA;
+      this.fB = pB;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("a".equals(parameterName)) return this.fA;
+      if ("b".equals(parameterName)) return this.fB;
+      return null;
+    }
+    
+    public EReference getA() {
+      return this.fA;
+    }
+    
+    public EReference getB() {
+      return this.fB;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("a".equals(parameterName) ) {
+          this.fA = (EReference) newValue;
+          return true;
+      }
+      if ("b".equals(parameterName) ) {
+          this.fB = (EReference) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setA(final EReference pA) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fA = pA;
+    }
+    
+    public void setB(final EReference pB) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fB = pB;
+    }
+    
+    @Override
+    public String patternName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.opposite";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return Opposite.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fA, fB};
+    }
+    
+    @Override
+    public Opposite.Match toImmutable() {
+      return isMutable() ? newMatch(fA, fB) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"a\"=" + prettyPrintValue(fA) + ", ");
+      result.append("\"b\"=" + prettyPrintValue(fB));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fA, fB);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof Opposite.Match)) {
+          Opposite.Match other = (Opposite.Match) obj;
+          return Objects.equals(fA, other.fA) && Objects.equals(fB, other.fB);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public Opposite specification() {
+      return Opposite.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static Opposite.Match newEmptyMatch() {
+      return new Mutable(null, null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static Opposite.Match newMutableMatch(final EReference pA, final EReference pB) {
+      return new Mutable(pA, pB);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static Opposite.Match newMatch(final EReference pA, final EReference pB) {
+      return new Immutable(pA, pB);
+    }
+    
+    private static final class Mutable extends Opposite.Match {
+      Mutable(final EReference pA, final EReference pB) {
+        super(pA, pB);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends Opposite.Match {
+      Immutable(final EReference pA, final EReference pB) {
+        super(pA, pB);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.opposite pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * pattern opposite(a:EReference, b: EReference) {
+   * 	EReference.eOpposite(a,b);
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see Opposite
+   * 
+   */
+  public static class Matcher extends BaseMatcher<Opposite.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static Opposite.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static Opposite.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_A = 0;
+    
+    private static final int POSITION_B = 1;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(Opposite.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<Opposite.Match> getAllMatches(final EReference pA, final EReference pB) {
+      return rawStreamAllMatches(new Object[]{pA, pB}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<Opposite.Match> streamAllMatches(final EReference pA, final EReference pB) {
+      return rawStreamAllMatches(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<Opposite.Match> getOneArbitraryMatch(final EReference pA, final EReference pB) {
+      return rawGetOneArbitraryMatch(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final EReference pA, final EReference pB) {
+      return rawHasMatch(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final EReference pA, final EReference pB) {
+      return rawCountMatches(new Object[]{pA, pB});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final EReference pA, final EReference pB, final Consumer<? super Opposite.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pA, pB}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param pB the fixed value of pattern parameter b, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public Opposite.Match newMatch(final EReference pA, final EReference pB) {
+      return Opposite.Match.newMatch(pA, pB);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<EReference> rawStreamAllValuesOfa(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_A, parameters).map(EReference.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfa(final Opposite.Match partialMatch) {
+      return rawStreamAllValuesOfa(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfa(final EReference pB) {
+      return rawStreamAllValuesOfa(new Object[]{null, pB});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfa(final Opposite.Match partialMatch) {
+      return rawStreamAllValuesOfa(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfa(final EReference pB) {
+      return rawStreamAllValuesOfa(new Object[]{null, pB}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<EReference> rawStreamAllValuesOfb(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_B, parameters).map(EReference.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfb() {
+      return rawStreamAllValuesOfb(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfb() {
+      return rawStreamAllValuesOfb(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfb(final Opposite.Match partialMatch) {
+      return rawStreamAllValuesOfb(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfb(final EReference pA) {
+      return rawStreamAllValuesOfb(new Object[]{pA, null});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfb(final Opposite.Match partialMatch) {
+      return rawStreamAllValuesOfb(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for b.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfb(final EReference pA) {
+      return rawStreamAllValuesOfb(new Object[]{pA, null}).collect(Collectors.toSet());
+    }
+    
+    @Override
+    protected Opposite.Match tupleToMatch(final Tuple t) {
+      try {
+          return Opposite.Match.newMatch((EReference) t.get(POSITION_A), (EReference) t.get(POSITION_B));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected Opposite.Match arrayToMatch(final Object[] match) {
+      try {
+          return Opposite.Match.newMatch((EReference) match[POSITION_A], (EReference) match[POSITION_B]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected Opposite.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return Opposite.Match.newMutableMatch((EReference) match[POSITION_A], (EReference) match[POSITION_B]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<Opposite.Matcher> querySpecification() {
+      return Opposite.instance();
+    }
+  }
+  
+  private Opposite() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static Opposite instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected Opposite.Matcher instantiate(final ViatraQueryEngine engine) {
+    return Opposite.Matcher.on(engine);
+  }
+  
+  @Override
+  public Opposite.Matcher instantiate() {
+    return Opposite.Matcher.create();
+  }
+  
+  @Override
+  public Opposite.Match newEmptyMatch() {
+    return Opposite.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public Opposite.Match newMatch(final Object... parameters) {
+    return Opposite.Match.newMatch((org.eclipse.emf.ecore.EReference) parameters[0], (org.eclipse.emf.ecore.EReference) parameters[1]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Opposite (visibility: PUBLIC, simpleName: Opposite, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Opposite, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Opposite (visibility: PUBLIC, simpleName: Opposite, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Opposite, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final Opposite INSTANCE = new Opposite();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private static final Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private static final Opposite.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_a = new PParameter("a", "org.eclipse.emf.ecore.EReference", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("http://www.eclipse.org/emf/2002/Ecore", "EReference")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_b = new PParameter("b", "org.eclipse.emf.ecore.EReference", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("http://www.eclipse.org/emf/2002/Ecore", "EReference")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_a, parameter_b);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.opposite";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("a","b");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_a = body.getOrCreateVariableByName("a");
+          PVariable var_b = body.getOrCreateVariableByName("b");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_b), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_a, parameter_a),
+             new ExportedParameter(body, var_b, parameter_b)
+          ));
+          // 	EReference.eOpposite(a,b)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference", "eOpposite")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          new Equality(body, var__virtual_0_, var_b);
+          bodies.add(body);
+      }
+      return bodies;
+    }
+  }
+}
diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/OppositeDifferentClass.java b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/OppositeDifferentClass.java
new file mode 100644
index 00000000..887f8584
--- /dev/null
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/OppositeDifferentClass.java
@@ -0,0 +1,577 @@
+/**
+ * Generated from platform:/resource/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/patterns/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/Ecore.vql
+ */
+package hu.bme.mit.inf.dslreasoner.domains.alloyexamples;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.emf.types.EStructuralFeatureInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.PAnnotation;
+import org.eclipse.viatra.query.runtime.matchers.psystem.annotations.ParameterReference;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.Equality;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.Inequality;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         {@literal @}Constraint(key={a}, severity="error", message="error")
+ *         pattern oppositeDifferentClass(a:EReference) {
+ *         	EReference.eOpposite(a,b);
+ *         	EReference.eContainingClass(a,aContaining);
+ *         	EReference.eType(b,bTarget);
+ *         	aContaining != bTarget;
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class OppositeDifferentClass extends BaseGeneratedEMFQuerySpecification<OppositeDifferentClass.Matcher> {
+  /**
+   * Pattern-specific match representation of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.oppositeDifferentClass pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private EReference fA;
+    
+    private static List<String> parameterNames = makeImmutableList("a");
+    
+    private Match(final EReference pA) {
+      this.fA = pA;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("a".equals(parameterName)) return this.fA;
+      return null;
+    }
+    
+    public EReference getA() {
+      return this.fA;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("a".equals(parameterName) ) {
+          this.fA = (EReference) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setA(final EReference pA) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fA = pA;
+    }
+    
+    @Override
+    public String patternName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.oppositeDifferentClass";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return OppositeDifferentClass.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fA};
+    }
+    
+    @Override
+    public OppositeDifferentClass.Match toImmutable() {
+      return isMutable() ? newMatch(fA) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"a\"=" + prettyPrintValue(fA));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fA);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof OppositeDifferentClass.Match)) {
+          OppositeDifferentClass.Match other = (OppositeDifferentClass.Match) obj;
+          return Objects.equals(fA, other.fA);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public OppositeDifferentClass specification() {
+      return OppositeDifferentClass.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static OppositeDifferentClass.Match newEmptyMatch() {
+      return new Mutable(null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static OppositeDifferentClass.Match newMutableMatch(final EReference pA) {
+      return new Mutable(pA);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static OppositeDifferentClass.Match newMatch(final EReference pA) {
+      return new Immutable(pA);
+    }
+    
+    private static final class Mutable extends OppositeDifferentClass.Match {
+      Mutable(final EReference pA) {
+        super(pA);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends OppositeDifferentClass.Match {
+      Immutable(final EReference pA) {
+        super(pA);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.oppositeDifferentClass pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * {@literal @}Constraint(key={a}, severity="error", message="error")
+   * pattern oppositeDifferentClass(a:EReference) {
+   * 	EReference.eOpposite(a,b);
+   * 	EReference.eContainingClass(a,aContaining);
+   * 	EReference.eType(b,bTarget);
+   * 	aContaining != bTarget;
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see OppositeDifferentClass
+   * 
+   */
+  public static class Matcher extends BaseMatcher<OppositeDifferentClass.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static OppositeDifferentClass.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static OppositeDifferentClass.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_A = 0;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(OppositeDifferentClass.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<OppositeDifferentClass.Match> getAllMatches(final EReference pA) {
+      return rawStreamAllMatches(new Object[]{pA}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<OppositeDifferentClass.Match> streamAllMatches(final EReference pA) {
+      return rawStreamAllMatches(new Object[]{pA});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<OppositeDifferentClass.Match> getOneArbitraryMatch(final EReference pA) {
+      return rawGetOneArbitraryMatch(new Object[]{pA});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final EReference pA) {
+      return rawHasMatch(new Object[]{pA});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final EReference pA) {
+      return rawCountMatches(new Object[]{pA});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final EReference pA, final Consumer<? super OppositeDifferentClass.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pA}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pA the fixed value of pattern parameter a, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public OppositeDifferentClass.Match newMatch(final EReference pA) {
+      return OppositeDifferentClass.Match.newMatch(pA);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<EReference> rawStreamAllValuesOfa(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_A, parameters).map(EReference.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<EReference> getAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for a.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<EReference> streamAllValuesOfa() {
+      return rawStreamAllValuesOfa(emptyArray());
+    }
+    
+    @Override
+    protected OppositeDifferentClass.Match tupleToMatch(final Tuple t) {
+      try {
+          return OppositeDifferentClass.Match.newMatch((EReference) t.get(POSITION_A));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected OppositeDifferentClass.Match arrayToMatch(final Object[] match) {
+      try {
+          return OppositeDifferentClass.Match.newMatch((EReference) match[POSITION_A]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected OppositeDifferentClass.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return OppositeDifferentClass.Match.newMutableMatch((EReference) match[POSITION_A]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<OppositeDifferentClass.Matcher> querySpecification() {
+      return OppositeDifferentClass.instance();
+    }
+  }
+  
+  private OppositeDifferentClass() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static OppositeDifferentClass instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected OppositeDifferentClass.Matcher instantiate(final ViatraQueryEngine engine) {
+    return OppositeDifferentClass.Matcher.on(engine);
+  }
+  
+  @Override
+  public OppositeDifferentClass.Matcher instantiate() {
+    return OppositeDifferentClass.Matcher.create();
+  }
+  
+  @Override
+  public OppositeDifferentClass.Match newEmptyMatch() {
+    return OppositeDifferentClass.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public OppositeDifferentClass.Match newMatch(final Object... parameters) {
+    return OppositeDifferentClass.Match.newMatch((org.eclipse.emf.ecore.EReference) parameters[0]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.OppositeDifferentClass (visibility: PUBLIC, simpleName: OppositeDifferentClass, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.OppositeDifferentClass, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.OppositeDifferentClass (visibility: PUBLIC, simpleName: OppositeDifferentClass, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.OppositeDifferentClass, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final OppositeDifferentClass INSTANCE = new OppositeDifferentClass();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private static final Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private static final OppositeDifferentClass.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_a = new PParameter("a", "org.eclipse.emf.ecore.EReference", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("http://www.eclipse.org/emf/2002/Ecore", "EReference")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_a);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.oppositeDifferentClass";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("a");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_a = body.getOrCreateVariableByName("a");
+          PVariable var_b = body.getOrCreateVariableByName("b");
+          PVariable var_aContaining = body.getOrCreateVariableByName("aContaining");
+          PVariable var_bTarget = body.getOrCreateVariableByName("bTarget");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_a, parameter_a)
+          ));
+          // 	EReference.eOpposite(a,b)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference", "eOpposite")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          new Equality(body, var__virtual_0_, var_b);
+          // 	EReference.eContainingClass(a,aContaining)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          PVariable var__virtual_1_ = body.getOrCreateVariableByName(".virtual{1}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_a, var__virtual_1_), new EStructuralFeatureInstancesKey(getFeatureLiteral("http://www.eclipse.org/emf/2002/Ecore", "EStructuralFeature", "eContainingClass")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_1_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EClass")));
+          new Equality(body, var__virtual_1_, var_aContaining);
+          // 	EReference.eType(b,bTarget)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_b), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EReference")));
+          PVariable var__virtual_2_ = body.getOrCreateVariableByName(".virtual{2}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_b, var__virtual_2_), new EStructuralFeatureInstancesKey(getFeatureLiteral("http://www.eclipse.org/emf/2002/Ecore", "ETypedElement", "eType")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_2_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("http://www.eclipse.org/emf/2002/Ecore", "EClassifier")));
+          new Equality(body, var__virtual_2_, var_bTarget);
+          // 	aContaining != bTarget
+          new Inequality(body, var_aContaining, var_bTarget);
+          bodies.add(body);
+      }
+      {
+          PAnnotation annotation = new PAnnotation("Constraint");
+          annotation.addAttribute("key", Arrays.asList(new Object[] {
+                              new ParameterReference("a")
+                              }));
+          annotation.addAttribute("severity", "error");
+          annotation.addAttribute("message", "error");
+          addAnnotation(annotation);
+      }
+      return bodies;
+    }
+  }
+}
diff --git a/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/PatternContent.java b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/PatternContent.java
new file mode 100644
index 00000000..690d3e27
--- /dev/null
+++ b/Domains/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/src-gen/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/PatternContent.java
@@ -0,0 +1,693 @@
+/**
+ * Generated from platform:/resource/hu.bme.mit.inf.dslreasoner.domains.alloyexamples/patterns/hu/bme/mit/inf/dslreasoner/domains/alloyexamples/FileSystem.vql
+ */
+package hu.bme.mit.inf.dslreasoner.domains.alloyexamples;
+
+import hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+import org.apache.log4j.Logger;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.viatra.query.runtime.api.IPatternMatch;
+import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFPQuery;
+import org.eclipse.viatra.query.runtime.api.impl.BaseGeneratedEMFQuerySpecification;
+import org.eclipse.viatra.query.runtime.api.impl.BaseMatcher;
+import org.eclipse.viatra.query.runtime.api.impl.BasePatternMatch;
+import org.eclipse.viatra.query.runtime.emf.types.EClassTransitiveInstancesKey;
+import org.eclipse.viatra.query.runtime.emf.types.EStructuralFeatureInstancesKey;
+import org.eclipse.viatra.query.runtime.matchers.backend.QueryEvaluationHint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PBody;
+import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.Equality;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExportedParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.TypeConstraint;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameter;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PParameterDirection;
+import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PVisibility;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuple;
+import org.eclipse.viatra.query.runtime.matchers.tuple.Tuples;
+import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;
+
+/**
+ * A pattern-specific query specification that can instantiate Matcher in a type-safe way.
+ * 
+ * <p>Original source:
+ *         <code><pre>
+ *         pattern patternContent(o1: FSObject, o2: FSObject) {
+ *         	Dir.contents(o1,o2);
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class PatternContent extends BaseGeneratedEMFQuerySpecification<PatternContent.Matcher> {
+  /**
+   * Pattern-specific match representation of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.patternContent pattern,
+   * to be used in conjunction with {@link Matcher}.
+   * 
+   * <p>Class fields correspond to parameters of the pattern. Fields with value null are considered unassigned.
+   * Each instance is a (possibly partial) substitution of pattern parameters,
+   * usable to represent a match of the pattern in the result of a query,
+   * or to specify the bound (fixed) input parameters when issuing a query.
+   * 
+   * @see Matcher
+   * 
+   */
+  public static abstract class Match extends BasePatternMatch {
+    private FSObject fO1;
+    
+    private FSObject fO2;
+    
+    private static List<String> parameterNames = makeImmutableList("o1", "o2");
+    
+    private Match(final FSObject pO1, final FSObject pO2) {
+      this.fO1 = pO1;
+      this.fO2 = pO2;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      if ("o1".equals(parameterName)) return this.fO1;
+      if ("o2".equals(parameterName)) return this.fO2;
+      return null;
+    }
+    
+    public FSObject getO1() {
+      return this.fO1;
+    }
+    
+    public FSObject getO2() {
+      return this.fO2;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("o1".equals(parameterName) ) {
+          this.fO1 = (FSObject) newValue;
+          return true;
+      }
+      if ("o2".equals(parameterName) ) {
+          this.fO2 = (FSObject) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setO1(final FSObject pO1) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fO1 = pO1;
+    }
+    
+    public void setO2(final FSObject pO2) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fO2 = pO2;
+    }
+    
+    @Override
+    public String patternName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.patternContent";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return PatternContent.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fO1, fO2};
+    }
+    
+    @Override
+    public PatternContent.Match toImmutable() {
+      return isMutable() ? newMatch(fO1, fO2) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"o1\"=" + prettyPrintValue(fO1) + ", ");
+      result.append("\"o2\"=" + prettyPrintValue(fO2));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fO1, fO2);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof PatternContent.Match)) {
+          PatternContent.Match other = (PatternContent.Match) obj;
+          return Objects.equals(fO1, other.fO1) && Objects.equals(fO2, other.fO2);
+      } else {
+          // this should be infrequent
+          if (!(obj instanceof IPatternMatch)) {
+              return false;
+          }
+          IPatternMatch otherSig  = (IPatternMatch) obj;
+          return Objects.equals(specification(), otherSig.specification()) && Arrays.deepEquals(toArray(), otherSig.toArray());
+      }
+    }
+    
+    @Override
+    public PatternContent specification() {
+      return PatternContent.instance();
+    }
+    
+    /**
+     * Returns an empty, mutable match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @return the empty match.
+     * 
+     */
+    public static PatternContent.Match newEmptyMatch() {
+      return new Mutable(null, null);
+    }
+    
+    /**
+     * Returns a mutable (partial) match.
+     * Fields of the mutable match can be filled to create a partial match, usable as matcher input.
+     * 
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static PatternContent.Match newMutableMatch(final FSObject pO1, final FSObject pO2) {
+      return new Mutable(pO1, pO2);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static PatternContent.Match newMatch(final FSObject pO1, final FSObject pO2) {
+      return new Immutable(pO1, pO2);
+    }
+    
+    private static final class Mutable extends PatternContent.Match {
+      Mutable(final FSObject pO1, final FSObject pO2) {
+        super(pO1, pO2);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends PatternContent.Match {
+      Immutable(final FSObject pO1, final FSObject pO2) {
+        super(pO1, pO2);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the hu.bme.mit.inf.dslreasoner.domains.alloyexamples.patternContent pattern,
+   * providing pattern-specific query methods.
+   * 
+   * <p>Use the pattern matcher on a given model via {@link #on(ViatraQueryEngine)},
+   * e.g. in conjunction with {@link ViatraQueryEngine#on(QueryScope)}.
+   * 
+   * <p>Matches of the pattern will be represented as {@link Match}.
+   * 
+   * <p>Original source:
+   * <code><pre>
+   * pattern patternContent(o1: FSObject, o2: FSObject) {
+   * 	Dir.contents(o1,o2);
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see PatternContent
+   * 
+   */
+  public static class Matcher extends BaseMatcher<PatternContent.Match> {
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    public static PatternContent.Matcher on(final ViatraQueryEngine engine) {
+      // check if matcher already exists
+      Matcher matcher = engine.getExistingMatcher(querySpecification());
+      if (matcher == null) {
+          matcher = (Matcher)engine.getMatcher(querySpecification());
+      }
+      return matcher;
+    }
+    
+    /**
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * @return an initialized matcher
+     * @noreference This method is for internal matcher initialization by the framework, do not call it manually.
+     * 
+     */
+    public static PatternContent.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_O1 = 0;
+    
+    private static final int POSITION_O2 = 1;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(PatternContent.Matcher.class);
+    
+    /**
+     * Initializes the pattern matcher within an existing VIATRA Query engine.
+     * If the pattern matcher is already constructed in the engine, only a light-weight reference is returned.
+     * 
+     * @param engine the existing VIATRA Query engine in which this matcher will be created.
+     * @throws ViatraQueryRuntimeException if an error occurs during pattern matcher creation
+     * 
+     */
+    private Matcher() {
+      super(querySpecification());
+    }
+    
+    /**
+     * Returns the set of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<PatternContent.Match> getAllMatches(final FSObject pO1, final FSObject pO2) {
+      return rawStreamAllMatches(new Object[]{pO1, pO2}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Returns a stream of all matches of the pattern that conform to the given fixed values of some parameters.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<PatternContent.Match> streamAllMatches(final FSObject pO1, final FSObject pO2) {
+      return rawStreamAllMatches(new Object[]{pO1, pO2});
+    }
+    
+    /**
+     * Returns an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<PatternContent.Match> getOneArbitraryMatch(final FSObject pO1, final FSObject pO2) {
+      return rawGetOneArbitraryMatch(new Object[]{pO1, pO2});
+    }
+    
+    /**
+     * Indicates whether the given combination of specified pattern parameters constitute a valid pattern match,
+     * under any possible substitution of the unspecified parameters (if any).
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final FSObject pO1, final FSObject pO2) {
+      return rawHasMatch(new Object[]{pO1, pO2});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final FSObject pO1, final FSObject pO2) {
+      return rawCountMatches(new Object[]{pO1, pO2});
+    }
+    
+    /**
+     * Executes the given processor on an arbitrarily chosen match of the pattern that conforms to the given fixed values of some parameters.
+     * Neither determinism nor randomness of selection is guaranteed.
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @param processor the action that will process the selected match.
+     * @return true if the pattern has at least one match with the given parameter values, false if the processor was not invoked
+     * 
+     */
+    public boolean forOneArbitraryMatch(final FSObject pO1, final FSObject pO2, final Consumer<? super PatternContent.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pO1, pO2}, processor);
+    }
+    
+    /**
+     * Returns a new (partial) match.
+     * This can be used e.g. to call the matcher with a partial match.
+     * <p>The returned match will be immutable. Use {@link #newEmptyMatch()} to obtain a mutable match object.
+     * @param pO1 the fixed value of pattern parameter o1, or null if not bound.
+     * @param pO2 the fixed value of pattern parameter o2, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public PatternContent.Match newMatch(final FSObject pO1, final FSObject pO2) {
+      return PatternContent.Match.newMatch(pO1, pO2);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<FSObject> rawStreamAllValuesOfo1(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_O1, parameters).map(FSObject.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfo1() {
+      return rawStreamAllValuesOfo1(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfo1() {
+      return rawStreamAllValuesOfo1(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o1.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfo1(final PatternContent.Match partialMatch) {
+      return rawStreamAllValuesOfo1(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o1.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfo1(final FSObject pO2) {
+      return rawStreamAllValuesOfo1(new Object[]{null, pO2});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfo1(final PatternContent.Match partialMatch) {
+      return rawStreamAllValuesOfo1(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o1.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfo1(final FSObject pO2) {
+      return rawStreamAllValuesOfo1(new Object[]{null, pO2}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<FSObject> rawStreamAllValuesOfo2(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_O2, parameters).map(FSObject.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfo2() {
+      return rawStreamAllValuesOfo2(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfo2() {
+      return rawStreamAllValuesOfo2(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o2.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfo2(final PatternContent.Match partialMatch) {
+      return rawStreamAllValuesOfo2(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o2.
+     * </p>
+     * <strong>NOTE</strong>: It is important not to modify the source model while the stream is being processed.
+     * If the match set of the pattern changes during processing, the contents of the stream is <strong>undefined</strong>.
+     * In such cases, either rely on {@link #getAllMatches()} or collect the results of the stream in end-user code.
+     *      
+     * @return the Stream of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<FSObject> streamAllValuesOfo2(final FSObject pO1) {
+      return rawStreamAllValuesOfo2(new Object[]{pO1, null});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfo2(final PatternContent.Match partialMatch) {
+      return rawStreamAllValuesOfo2(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for o2.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<FSObject> getAllValuesOfo2(final FSObject pO1) {
+      return rawStreamAllValuesOfo2(new Object[]{pO1, null}).collect(Collectors.toSet());
+    }
+    
+    @Override
+    protected PatternContent.Match tupleToMatch(final Tuple t) {
+      try {
+          return PatternContent.Match.newMatch((FSObject) t.get(POSITION_O1), (FSObject) t.get(POSITION_O2));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected PatternContent.Match arrayToMatch(final Object[] match) {
+      try {
+          return PatternContent.Match.newMatch((FSObject) match[POSITION_O1], (FSObject) match[POSITION_O2]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected PatternContent.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return PatternContent.Match.newMutableMatch((FSObject) match[POSITION_O1], (FSObject) match[POSITION_O2]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    /**
+     * @return the singleton instance of the query specification of this pattern
+     * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+     * 
+     */
+    public static IQuerySpecification<PatternContent.Matcher> querySpecification() {
+      return PatternContent.instance();
+    }
+  }
+  
+  private PatternContent() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static PatternContent instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected PatternContent.Matcher instantiate(final ViatraQueryEngine engine) {
+    return PatternContent.Matcher.on(engine);
+  }
+  
+  @Override
+  public PatternContent.Matcher instantiate() {
+    return PatternContent.Matcher.create();
+  }
+  
+  @Override
+  public PatternContent.Match newEmptyMatch() {
+    return PatternContent.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public PatternContent.Match newMatch(final Object... parameters) {
+    return PatternContent.Match.newMatch((hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject) parameters[0], (hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject) parameters[1]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.PatternContent (visibility: PUBLIC, simpleName: PatternContent, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.PatternContent, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link JvmGenericType: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.PatternContent (visibility: PUBLIC, simpleName: PatternContent, identifier: hu.bme.mit.inf.dslreasoner.domains.alloyexamples.PatternContent, deprecated: <unset>) (abstract: false, static: false, final: true, packageName: hu.bme.mit.inf.dslreasoner.domains.alloyexamples) (interface: false, strictFloatingPoint: false, anonymous: false)#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final PatternContent INSTANCE = new PatternContent();
+    
+    /**
+     * Statically initializes the query specification <b>after</b> the field {@link #INSTANCE} is assigned.
+     * This initialization order is required to support indirect recursion.
+     * 
+     * <p> The static initializer is defined using a helper field to work around limitations of the code generator.
+     * 
+     */
+    private static final Object STATIC_INITIALIZER = ensureInitialized();
+    
+    public static Object ensureInitialized() {
+      INSTANCE.ensureInitializedInternal();
+      return null;
+    }
+  }
+  
+  private static class GeneratedPQuery extends BaseGeneratedEMFPQuery {
+    private static final PatternContent.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_o1 = new PParameter("o1", "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("FS", "FSObject")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_o2 = new PParameter("o2", "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.Filesystem.FSObject", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("FS", "FSObject")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_o1, parameter_o2);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "hu.bme.mit.inf.dslreasoner.domains.alloyexamples.patternContent";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("o1","o2");
+    }
+    
+    @Override
+    public List<PParameter> getParameters() {
+      return parameters;
+    }
+    
+    @Override
+    public Set<PBody> doGetContainedBodies() {
+      setEvaluationHints(new QueryEvaluationHint(null, QueryEvaluationHint.BackendRequirement.UNSPECIFIED));
+      Set<PBody> bodies = new LinkedHashSet<>();
+      {
+          PBody body = new PBody(this);
+          PVariable var_o1 = body.getOrCreateVariableByName("o1");
+          PVariable var_o2 = body.getOrCreateVariableByName("o2");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_o1), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_o2), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_o1, parameter_o1),
+             new ExportedParameter(body, var_o2, parameter_o2)
+          ));
+          // 	Dir.contents(o1,o2)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_o1), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "Dir")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_o1, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("FS", "Dir", "contents")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("FS", "FSObject")));
+          new Equality(body, var__virtual_0_, var_o2);
+          bodies.add(body);
+      }
+      return bodies;
+    }
+  }
+}
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