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diff --git a/Domains/github-graph/src-gen/queries/CheckUserAction.java b/Domains/github-graph/src-gen/queries/CheckUserAction.java
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+++ b/Domains/github-graph/src-gen/queries/CheckUserAction.java
@@ -0,0 +1,946 @@
+/**
+ * Generated from platform:/resource/github-graph/queries/queries/github.vql
+ */
+package queries;
+
+import github.Action;
+import github.Issue;
+import github.IssueEvent;
+import github.User;
+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.EDataType;
+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.EDataTypeInSlotsKey;
+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 checkUserAction(i: Issue, u: User, e: IssueEvent, t: Action) {
+ *              Issue.issueevent(i, e);
+ *              IssueEvent.user(e, u);
+ *              IssueEvent.action(e, a);
+ *              a == t;
+ *         }
+ * </pre></code>
+ * 
+ * @see Matcher
+ * @see Match
+ * 
+ */
+@SuppressWarnings("all")
+public final class CheckUserAction extends BaseGeneratedEMFQuerySpecification<CheckUserAction.Matcher> {
+  /**
+   * Pattern-specific match representation of the queries.checkUserAction 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 Issue fI;
+    
+    private User fU;
+    
+    private IssueEvent fE;
+    
+    private Action fT;
+    
+    private static List<String> parameterNames = makeImmutableList("i", "u", "e", "t");
+    
+    private Match(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      this.fI = pI;
+      this.fU = pU;
+      this.fE = pE;
+      this.fT = pT;
+    }
+    
+    @Override
+    public Object get(final String parameterName) {
+      switch(parameterName) {
+          case "i": return this.fI;
+          case "u": return this.fU;
+          case "e": return this.fE;
+          case "t": return this.fT;
+          default: return null;
+      }
+    }
+    
+    @Override
+    public Object get(final int index) {
+      switch(index) {
+          case 0: return this.fI;
+          case 1: return this.fU;
+          case 2: return this.fE;
+          case 3: return this.fT;
+          default: return null;
+      }
+    }
+    
+    public Issue getI() {
+      return this.fI;
+    }
+    
+    public User getU() {
+      return this.fU;
+    }
+    
+    public IssueEvent getE() {
+      return this.fE;
+    }
+    
+    public Action getT() {
+      return this.fT;
+    }
+    
+    @Override
+    public boolean set(final String parameterName, final Object newValue) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      if ("i".equals(parameterName) ) {
+          this.fI = (Issue) newValue;
+          return true;
+      }
+      if ("u".equals(parameterName) ) {
+          this.fU = (User) newValue;
+          return true;
+      }
+      if ("e".equals(parameterName) ) {
+          this.fE = (IssueEvent) newValue;
+          return true;
+      }
+      if ("t".equals(parameterName) ) {
+          this.fT = (Action) newValue;
+          return true;
+      }
+      return false;
+    }
+    
+    public void setI(final Issue pI) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fI = pI;
+    }
+    
+    public void setU(final User pU) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fU = pU;
+    }
+    
+    public void setE(final IssueEvent pE) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fE = pE;
+    }
+    
+    public void setT(final Action pT) {
+      if (!isMutable()) throw new java.lang.UnsupportedOperationException();
+      this.fT = pT;
+    }
+    
+    @Override
+    public String patternName() {
+      return "queries.checkUserAction";
+    }
+    
+    @Override
+    public List<String> parameterNames() {
+      return CheckUserAction.Match.parameterNames;
+    }
+    
+    @Override
+    public Object[] toArray() {
+      return new Object[]{fI, fU, fE, fT};
+    }
+    
+    @Override
+    public CheckUserAction.Match toImmutable() {
+      return isMutable() ? newMatch(fI, fU, fE, fT) : this;
+    }
+    
+    @Override
+    public String prettyPrint() {
+      StringBuilder result = new StringBuilder();
+      result.append("\"i\"=" + prettyPrintValue(fI) + ", ");
+      result.append("\"u\"=" + prettyPrintValue(fU) + ", ");
+      result.append("\"e\"=" + prettyPrintValue(fE) + ", ");
+      result.append("\"t\"=" + prettyPrintValue(fT));
+      return result.toString();
+    }
+    
+    @Override
+    public int hashCode() {
+      return Objects.hash(fI, fU, fE, fT);
+    }
+    
+    @Override
+    public boolean equals(final Object obj) {
+      if (this == obj)
+          return true;
+      if (obj == null) {
+          return false;
+      }
+      if ((obj instanceof CheckUserAction.Match)) {
+          CheckUserAction.Match other = (CheckUserAction.Match) obj;
+          return Objects.equals(fI, other.fI) && Objects.equals(fU, other.fU) && Objects.equals(fE, other.fE) && Objects.equals(fT, other.fT);
+      } 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 CheckUserAction specification() {
+      return CheckUserAction.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 CheckUserAction.Match newEmptyMatch() {
+      return new Mutable(null, null, 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 pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, or null if not bound.
+     * @return the new, mutable (partial) match object.
+     * 
+     */
+    public static CheckUserAction.Match newMutableMatch(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      return new Mutable(pI, pU, pE, pT);
+    }
+    
+    /**
+     * 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 pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public static CheckUserAction.Match newMatch(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      return new Immutable(pI, pU, pE, pT);
+    }
+    
+    private static final class Mutable extends CheckUserAction.Match {
+      Mutable(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+        super(pI, pU, pE, pT);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return true;
+      }
+    }
+    
+    private static final class Immutable extends CheckUserAction.Match {
+      Immutable(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+        super(pI, pU, pE, pT);
+      }
+      
+      @Override
+      public boolean isMutable() {
+        return false;
+      }
+    }
+  }
+  
+  /**
+   * Generated pattern matcher API of the queries.checkUserAction 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 checkUserAction(i: Issue, u: User, e: IssueEvent, t: Action) {
+   *    Issue.issueevent(i, e);
+   *    IssueEvent.user(e, u);
+   *    IssueEvent.action(e, a);
+   *    a == t;
+   * }
+   * </pre></code>
+   * 
+   * @see Match
+   * @see CheckUserAction
+   * 
+   */
+  public static class Matcher extends BaseMatcher<CheckUserAction.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 CheckUserAction.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 CheckUserAction.Matcher create() {
+      return new Matcher();
+    }
+    
+    private static final int POSITION_I = 0;
+    
+    private static final int POSITION_U = 1;
+    
+    private static final int POSITION_E = 2;
+    
+    private static final int POSITION_T = 3;
+    
+    private static final Logger LOGGER = ViatraQueryLoggingUtil.getLogger(CheckUserAction.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 pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, or null if not bound.
+     * @return matches represented as a Match object.
+     * 
+     */
+    public Collection<CheckUserAction.Match> getAllMatches(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      return rawStreamAllMatches(new Object[]{pI, pU, pE, pT}).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 pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, or null if not bound.
+     * @return a stream of matches represented as a Match object.
+     * 
+     */
+    public Stream<CheckUserAction.Match> streamAllMatches(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      return rawStreamAllMatches(new Object[]{pI, pU, pE, pT});
+    }
+    
+    /**
+     * 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 pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, or null if not bound.
+     * @return a match represented as a Match object, or null if no match is found.
+     * 
+     */
+    public Optional<CheckUserAction.Match> getOneArbitraryMatch(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      return rawGetOneArbitraryMatch(new Object[]{pI, pU, pE, pT});
+    }
+    
+    /**
+     * 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 pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, or null if not bound.
+     * @return true if the input is a valid (partial) match of the pattern.
+     * 
+     */
+    public boolean hasMatch(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      return rawHasMatch(new Object[]{pI, pU, pE, pT});
+    }
+    
+    /**
+     * Returns the number of all matches of the pattern that conform to the given fixed values of some parameters.
+     * @param pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, or null if not bound.
+     * @return the number of pattern matches found.
+     * 
+     */
+    public int countMatches(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      return rawCountMatches(new Object[]{pI, pU, pE, pT});
+    }
+    
+    /**
+     * 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 pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, 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 Issue pI, final User pU, final IssueEvent pE, final Action pT, final Consumer<? super CheckUserAction.Match> processor) {
+      return rawForOneArbitraryMatch(new Object[]{pI, pU, pE, pT}, 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 pI the fixed value of pattern parameter i, or null if not bound.
+     * @param pU the fixed value of pattern parameter u, or null if not bound.
+     * @param pE the fixed value of pattern parameter e, or null if not bound.
+     * @param pT the fixed value of pattern parameter t, or null if not bound.
+     * @return the (partial) match object.
+     * 
+     */
+    public CheckUserAction.Match newMatch(final Issue pI, final User pU, final IssueEvent pE, final Action pT) {
+      return CheckUserAction.Match.newMatch(pI, pU, pE, pT);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for i.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<Issue> rawStreamAllValuesOfi(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_I, parameters).map(Issue.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for i.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Issue> getAllValuesOfi() {
+      return rawStreamAllValuesOfi(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for i.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Issue> streamAllValuesOfi() {
+      return rawStreamAllValuesOfi(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for i.
+     * </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<Issue> streamAllValuesOfi(final CheckUserAction.Match partialMatch) {
+      return rawStreamAllValuesOfi(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for i.
+     * </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<Issue> streamAllValuesOfi(final User pU, final IssueEvent pE, final Action pT) {
+      return rawStreamAllValuesOfi(new Object[]{null, pU, pE, pT});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for i.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Issue> getAllValuesOfi(final CheckUserAction.Match partialMatch) {
+      return rawStreamAllValuesOfi(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for i.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Issue> getAllValuesOfi(final User pU, final IssueEvent pE, final Action pT) {
+      return rawStreamAllValuesOfi(new Object[]{null, pU, pE, pT}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for u.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<User> rawStreamAllValuesOfu(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_U, parameters).map(User.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for u.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<User> getAllValuesOfu() {
+      return rawStreamAllValuesOfu(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for u.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<User> streamAllValuesOfu() {
+      return rawStreamAllValuesOfu(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for u.
+     * </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<User> streamAllValuesOfu(final CheckUserAction.Match partialMatch) {
+      return rawStreamAllValuesOfu(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for u.
+     * </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<User> streamAllValuesOfu(final Issue pI, final IssueEvent pE, final Action pT) {
+      return rawStreamAllValuesOfu(new Object[]{pI, null, pE, pT});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for u.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<User> getAllValuesOfu(final CheckUserAction.Match partialMatch) {
+      return rawStreamAllValuesOfu(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for u.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<User> getAllValuesOfu(final Issue pI, final IssueEvent pE, final Action pT) {
+      return rawStreamAllValuesOfu(new Object[]{pI, null, pE, pT}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for e.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<IssueEvent> rawStreamAllValuesOfe(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_E, parameters).map(IssueEvent.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for e.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<IssueEvent> getAllValuesOfe() {
+      return rawStreamAllValuesOfe(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for e.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<IssueEvent> streamAllValuesOfe() {
+      return rawStreamAllValuesOfe(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for e.
+     * </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<IssueEvent> streamAllValuesOfe(final CheckUserAction.Match partialMatch) {
+      return rawStreamAllValuesOfe(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for e.
+     * </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<IssueEvent> streamAllValuesOfe(final Issue pI, final User pU, final Action pT) {
+      return rawStreamAllValuesOfe(new Object[]{pI, pU, null, pT});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for e.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<IssueEvent> getAllValuesOfe(final CheckUserAction.Match partialMatch) {
+      return rawStreamAllValuesOfe(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for e.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<IssueEvent> getAllValuesOfe(final Issue pI, final User pU, final Action pT) {
+      return rawStreamAllValuesOfe(new Object[]{pI, pU, null, pT}).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for t.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    protected Stream<Action> rawStreamAllValuesOft(final Object[] parameters) {
+      return rawStreamAllValues(POSITION_T, parameters).map(Action.class::cast);
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for t.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Action> getAllValuesOft() {
+      return rawStreamAllValuesOft(emptyArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for t.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Stream<Action> streamAllValuesOft() {
+      return rawStreamAllValuesOft(emptyArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for t.
+     * </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<Action> streamAllValuesOft(final CheckUserAction.Match partialMatch) {
+      return rawStreamAllValuesOft(partialMatch.toArray());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for t.
+     * </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<Action> streamAllValuesOft(final Issue pI, final User pU, final IssueEvent pE) {
+      return rawStreamAllValuesOft(new Object[]{pI, pU, pE, null});
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for t.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Action> getAllValuesOft(final CheckUserAction.Match partialMatch) {
+      return rawStreamAllValuesOft(partialMatch.toArray()).collect(Collectors.toSet());
+    }
+    
+    /**
+     * Retrieve the set of values that occur in matches for t.
+     * @return the Set of all values or empty set if there are no matches
+     * 
+     */
+    public Set<Action> getAllValuesOft(final Issue pI, final User pU, final IssueEvent pE) {
+      return rawStreamAllValuesOft(new Object[]{pI, pU, pE, null}).collect(Collectors.toSet());
+    }
+    
+    @Override
+    protected CheckUserAction.Match tupleToMatch(final Tuple t) {
+      try {
+          return CheckUserAction.Match.newMatch((Issue) t.get(POSITION_I), (User) t.get(POSITION_U), (IssueEvent) t.get(POSITION_E), (Action) t.get(POSITION_T));
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in tuple not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected CheckUserAction.Match arrayToMatch(final Object[] match) {
+      try {
+          return CheckUserAction.Match.newMatch((Issue) match[POSITION_I], (User) match[POSITION_U], (IssueEvent) match[POSITION_E], (Action) match[POSITION_T]);
+      } catch(ClassCastException e) {
+          LOGGER.error("Element(s) in array not properly typed!",e);
+          return null;
+      }
+    }
+    
+    @Override
+    protected CheckUserAction.Match arrayToMatchMutable(final Object[] match) {
+      try {
+          return CheckUserAction.Match.newMutableMatch((Issue) match[POSITION_I], (User) match[POSITION_U], (IssueEvent) match[POSITION_E], (Action) match[POSITION_T]);
+      } 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<CheckUserAction.Matcher> querySpecification() {
+      return CheckUserAction.instance();
+    }
+  }
+  
+  private CheckUserAction() {
+    super(GeneratedPQuery.INSTANCE);
+  }
+  
+  /**
+   * @return the singleton instance of the query specification
+   * @throws ViatraQueryRuntimeException if the pattern definition could not be loaded
+   * 
+   */
+  public static CheckUserAction instance() {
+    try{
+        return LazyHolder.INSTANCE;
+    } catch (ExceptionInInitializerError err) {
+        throw processInitializerError(err);
+    }
+  }
+  
+  @Override
+  protected CheckUserAction.Matcher instantiate(final ViatraQueryEngine engine) {
+    return CheckUserAction.Matcher.on(engine);
+  }
+  
+  @Override
+  public CheckUserAction.Matcher instantiate() {
+    return CheckUserAction.Matcher.create();
+  }
+  
+  @Override
+  public CheckUserAction.Match newEmptyMatch() {
+    return CheckUserAction.Match.newEmptyMatch();
+  }
+  
+  @Override
+  public CheckUserAction.Match newMatch(final Object... parameters) {
+    return CheckUserAction.Match.newMatch((github.Issue) parameters[0], (github.User) parameters[1], (github.IssueEvent) parameters[2], (github.Action) parameters[3]);
+  }
+  
+  /**
+   * Inner class allowing the singleton instance of {@link CheckUserAction} to be created 
+   *     <b>not</b> at the class load time of the outer class, 
+   *     but rather at the first call to {@link CheckUserAction#instance()}.
+   * 
+   * <p> This workaround is required e.g. to support recursion.
+   * 
+   */
+  private static class LazyHolder {
+    private static final CheckUserAction INSTANCE = new CheckUserAction();
+    
+    /**
+     * 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 CheckUserAction.GeneratedPQuery INSTANCE = new GeneratedPQuery();
+    
+    private final PParameter parameter_i = new PParameter("i", "github.Issue", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("sure.ghtorrent.github", "Issue")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_u = new PParameter("u", "github.User", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("sure.ghtorrent.github", "User")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_e = new PParameter("e", "github.IssueEvent", new EClassTransitiveInstancesKey((EClass)getClassifierLiteralSafe("sure.ghtorrent.github", "IssueEvent")), PParameterDirection.INOUT);
+    
+    private final PParameter parameter_t = new PParameter("t", "github.Action", new EDataTypeInSlotsKey((EDataType)getClassifierLiteralSafe("sure.ghtorrent.github", "Action")), PParameterDirection.INOUT);
+    
+    private final List<PParameter> parameters = Arrays.asList(parameter_i, parameter_u, parameter_e, parameter_t);
+    
+    private GeneratedPQuery() {
+      super(PVisibility.PUBLIC);
+    }
+    
+    @Override
+    public String getFullyQualifiedName() {
+      return "queries.checkUserAction";
+    }
+    
+    @Override
+    public List<String> getParameterNames() {
+      return Arrays.asList("i","u","e","t");
+    }
+    
+    @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_i = body.getOrCreateVariableByName("i");
+          PVariable var_u = body.getOrCreateVariableByName("u");
+          PVariable var_e = body.getOrCreateVariableByName("e");
+          PVariable var_t = body.getOrCreateVariableByName("t");
+          PVariable var_a = body.getOrCreateVariableByName("a");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_i), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("sure.ghtorrent.github", "Issue")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_u), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("sure.ghtorrent.github", "User")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_e), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("sure.ghtorrent.github", "IssueEvent")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var_t), new EDataTypeInSlotsKey((EDataType)getClassifierLiteral("sure.ghtorrent.github", "Action")));
+          body.setSymbolicParameters(Arrays.<ExportedParameter>asList(
+             new ExportedParameter(body, var_i, parameter_i),
+             new ExportedParameter(body, var_u, parameter_u),
+             new ExportedParameter(body, var_e, parameter_e),
+             new ExportedParameter(body, var_t, parameter_t)
+          ));
+          //    Issue.issueevent(i, e)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_i), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("sure.ghtorrent.github", "Issue")));
+          PVariable var__virtual_0_ = body.getOrCreateVariableByName(".virtual{0}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_i, var__virtual_0_), new EStructuralFeatureInstancesKey(getFeatureLiteral("sure.ghtorrent.github", "Issue", "issueevent")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_0_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("sure.ghtorrent.github", "IssueEvent")));
+          new Equality(body, var__virtual_0_, var_e);
+          //    IssueEvent.user(e, u)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_e), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("sure.ghtorrent.github", "IssueEvent")));
+          PVariable var__virtual_1_ = body.getOrCreateVariableByName(".virtual{1}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_e, var__virtual_1_), new EStructuralFeatureInstancesKey(getFeatureLiteral("sure.ghtorrent.github", "IssueEvent", "user")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_1_), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("sure.ghtorrent.github", "User")));
+          new Equality(body, var__virtual_1_, var_u);
+          //    IssueEvent.action(e, a)
+          new TypeConstraint(body, Tuples.flatTupleOf(var_e), new EClassTransitiveInstancesKey((EClass)getClassifierLiteral("sure.ghtorrent.github", "IssueEvent")));
+          PVariable var__virtual_2_ = body.getOrCreateVariableByName(".virtual{2}");
+          new TypeConstraint(body, Tuples.flatTupleOf(var_e, var__virtual_2_), new EStructuralFeatureInstancesKey(getFeatureLiteral("sure.ghtorrent.github", "IssueEvent", "action")));
+          new TypeConstraint(body, Tuples.flatTupleOf(var__virtual_2_), new EDataTypeInSlotsKey((EDataType)getClassifierLiteral("sure.ghtorrent.github", "Action")));
+          new Equality(body, var__virtual_2_, var_a);
+          //    a == t
+          new Equality(body, var_a, var_t);
+          bodies.add(body);
+      }
+      return bodies;
+    }
+  }
+}