Merge pull request #11 from kris7t/unique-to-individual

Rename unique to individual

20 files changed, 4053 insertions, 4053 deletions

diff --git a/language-ide/src/main/java/tools/refinery/language/ide/syntaxcoloring/ProblemSemanticHighlightingCalculator.java b/language-ide/src/main/java/tools/refinery/language/ide/syntaxcoloring/ProblemSemanticHighlightingCalculator.java
index 19eb1a03..01ac33f7 100644
--- a/language-ide/src/main/java/tools/refinery/language/ide/syntaxcoloring/ProblemSemanticHighlightingCalculator.java
+++ b/language-ide/src/main/java/tools/refinery/language/ide/syntaxcoloring/ProblemSemanticHighlightingCalculator.java
@@ -29,7 +29,7 @@ public class ProblemSemanticHighlightingCalculator extends DefaultSemanticHighli
         private static final String CONTAINMENT_CLASS = "containment";
         private static final String ERROR_CLASS = "error";
         private static final String NODE_CLASS = "node";
-        private static final String UNIQUE_NODE_CLASS = "unique";
+        private static final String INDIVIDUAL_NODE_CLASS = "individual";
         private static final String NEW_NODE_CLASS = "new";
 
         @Inject
@@ -109,8 +109,8 @@ public class ProblemSemanticHighlightingCalculator extends DefaultSemanticHighli
                         if (reference == ProblemPackage.Literals.VARIABLE_OR_NODE_ARGUMENT__VARIABLE_OR_NODE) {
                                 classesBuilder.add(NODE_CLASS);
                         }
-                        if (ProblemUtil.isUniqueNode(node)) {
-                                classesBuilder.add(UNIQUE_NODE_CLASS);
+                        if (ProblemUtil.isIndividualNode(node)) {
+                                classesBuilder.add(INDIVIDUAL_NODE_CLASS);
                         }
                         if (ProblemUtil.isNewNode(node)) {
                                 classesBuilder.add(NEW_NODE_CLASS);
diff --git a/language-model/problem.aird b/language-model/problem.aird
index c5652fe4..027070bf 100644
--- a/language-model/problem.aird
+++ b/language-model/problem.aird
@@ -1,3646 +1,3646 @@
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+        <endLabelStyle xmi:type="diagram:EndLabelStyle" uid="_-h0GoStaEeySS4mYSornnA" showIcon="false" labelColor="39,76,114">
+          <customFeatures>labelSize</customFeatures>
+        </endLabelStyle>
+      </ownedStyle>
+      <actualMapping xmi:type="description_1:EdgeMapping" href="platform:/plugin/org.eclipse.emf.ecoretools.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer/@edgeMappings[name='EC_EReference']"/>
+    </ownedDiagramElements>
+    <description xmi:type="description_1:DiagramDescription" href="platform:/plugin/org.eclipse.emf.ecoretools.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']"/>
+    <filterVariableHistory xmi:type="diagram:FilterVariableHistory" uid="_CsWlsKA4EeuqkpDnuik1sg"/>
+    <activatedLayers xmi:type="description_1:Layer" href="platform:/plugin/org.eclipse.emf.ecoretools.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@defaultLayer"/>
+    <activatedLayers xmi:type="description_1:AdditionalLayer" href="platform:/plugin/org.eclipse.emf.ecoretools.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@additionalLayers[name='Package']"/>
+    <activatedLayers xmi:type="description_1:AdditionalLayer" href="platform:/plugin/org.eclipse.emf.ecoretools.design/description/ecore.odesign#//@ownedViewpoints[name='Design']/@ownedRepresentations[name='Entities']/@additionalLayers[name='Validation']"/>
+    <target xmi:type="ecore:EPackage" href="src/main/resources/model/problem.ecore#/"/>
+  </diagram:DSemanticDiagram>
+</xmi:XMI>
diff --git a/language-model/src/main/java/tools/refinery/language/model/ProblemUtil.java b/language-model/src/main/java/tools/refinery/language/model/ProblemUtil.java
index 5f8641bf..d8958381 100644
--- a/language-model/src/main/java/tools/refinery/language/model/ProblemUtil.java
+++ b/language-model/src/main/java/tools/refinery/language/model/ProblemUtil.java
@@ -53,9 +53,9 @@ public final class ProblemUtil {
                 }
         }
 
-        public static boolean isUniqueNode(Node node) {
+        public static boolean isIndividualNode(Node node) {
                 var containingFeature = node.eContainingFeature();
-                return containingFeature == ProblemPackage.Literals.UNIQUE_DECLARATION__NODES
+                return containingFeature == ProblemPackage.Literals.INDIVIDUAL_DECLARATION__NODES
                                 || containingFeature == ProblemPackage.Literals.ENUM_DECLARATION__LITERALS;
         }
 
diff --git a/language-model/src/main/resources/model/problem.ecore b/language-model/src/main/resources/model/problem.ecore
index 775d124d..77211b66 100644
--- a/language-model/src/main/resources/model/problem.ecore
+++ b/language-model/src/main/resources/model/problem.ecore
@@ -1,191 +1,191 @@
-<?xml version="1.0" encoding="UTF-8"?>

-<ecore:EPackage xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

-    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="problem" nsURI="https://refinery.tools/emf/2021/Problem" nsPrefix="problem">

-  <eClassifiers xsi:type="ecore:EClass" name="Problem" eSuperTypes="#//NamedElement">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="nodes" upperBound="-1"

-        eType="#//Node" containment="true"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="statements" upperBound="-1"

-        eType="#//Statement" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Relation" abstract="true" eSuperTypes="#//NamedElement"/>

-  <eClassifiers xsi:type="ecore:EClass" name="ClassDeclaration" eSuperTypes="#//Relation #//Statement">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="abstract" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="superTypes" upperBound="-1"

-        eType="#//Relation"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="referenceDeclarations"

-        upperBound="-1" eType="#//ReferenceDeclaration" containment="true"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="newNode" eType="#//Node"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="ReferenceDeclaration" eSuperTypes="#//Relation">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="referenceType" eType="#//Relation"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="opposite" eType="#//ReferenceDeclaration"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="containment" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="multiplicity" eType="#//Multiplicity"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="NamedElement" abstract="true">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="PredicateDefinition" eSuperTypes="#//Relation #//ParametricDefinition">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="error" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="kind" eType="#//PredicateKind"

-        defaultValueLiteral="PARTIAL"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Parameter" eSuperTypes="#//Variable">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="parameterType" eType="#//Relation"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Variable" abstract="true" eSuperTypes="#//VariableOrNode"/>

-  <eClassifiers xsi:type="ecore:EClass" name="Conjunction" eSuperTypes="#//ExistentialQuantifier">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="literals" upperBound="-1"

-        eType="#//Literal" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Literal" abstract="true"/>

-  <eClassifiers xsi:type="ecore:EClass" name="Atom" eSuperTypes="#//Literal">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="relation" eType="#//Relation"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="transitiveClosure" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="arguments" upperBound="-1"

-        eType="#//Argument" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="ImplicitVariable" eSuperTypes="#//Variable"/>

-  <eClassifiers xsi:type="ecore:EClass" name="NegativeLiteral" eSuperTypes="#//ExistentialQuantifier #//CompoundLiteral"/>

-  <eClassifiers xsi:type="ecore:EClass" name="ExistentialQuantifier" abstract="true"

-      interface="true">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="implicitVariables" upperBound="-1"

-        eType="#//ImplicitVariable" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Assertion" eSuperTypes="#//Statement">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="relation" eType="#//Relation"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="value" eType="#//LogicValue"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="arguments" upperBound="-1"

-        eType="#//AssertionArgument" containment="true"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="default" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"

-        defaultValueLiteral="false"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Node" eSuperTypes="#//VariableOrNode"/>

-  <eClassifiers xsi:type="ecore:EEnum" name="LogicValue">

-    <eLiterals name="TRUE" literal="TRUE"/>

-    <eLiterals name="FALSE" value="1"/>

-    <eLiterals name="UNKNOWN" value="2"/>

-    <eLiterals name="ERROR" value="3"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="ScopeDeclaration" eSuperTypes="#//Statement">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="typeScopes" upperBound="-1"

-        eType="#//TypeScope" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Statement" abstract="true" interface="true"/>

-  <eClassifiers xsi:type="ecore:EClass" name="TypeScope">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="targetType" eType="#//ClassDeclaration"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="increment" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="multiplicity" eType="#//Multiplicity"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Multiplicity" abstract="true"/>

-  <eClassifiers xsi:type="ecore:EClass" name="RangeMultiplicity" eSuperTypes="#//Multiplicity">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="lowerBound" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"

-        defaultValueLiteral="0"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="upperBound" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"

-        defaultValueLiteral="-1"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="ExactMultiplicity" eSuperTypes="#//Multiplicity">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="exactValue" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"

-        defaultValueLiteral="1"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="UnboundedMultiplicity" eSuperTypes="#//Multiplicity"/>

-  <eClassifiers xsi:type="ecore:EClass" name="VariableOrNodeArgument" eSuperTypes="#//Argument">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="variableOrNode" eType="#//VariableOrNode"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="singletonVariable" eType="#//ImplicitVariable"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="EnumDeclaration" eSuperTypes="#//Relation #//Statement">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="literals" upperBound="-1"

-        eType="#//Node" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="VariableOrNode" abstract="true" eSuperTypes="#//NamedElement"/>

-  <eClassifiers xsi:type="ecore:EClass" name="Constant" abstract="true"/>

-  <eClassifiers xsi:type="ecore:EClass" name="IntConstant" eSuperTypes="#//Constant">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="intValue" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"

-        defaultValueLiteral="0"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="RealConstant" eSuperTypes="#//Constant">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="realValue" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EDouble"

-        defaultValueLiteral="0.0"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="StringConstant" eSuperTypes="#//Constant">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="stringValue" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="ConstantArgument" eSuperTypes="#//Argument">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="constant" eType="#//Constant"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Argument" abstract="true"/>

-  <eClassifiers xsi:type="ecore:EClass" name="NodeAssertionArgument" eSuperTypes="#//AssertionArgument">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="node" eType="#//Node"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="AssertionArgument" abstract="true"/>

-  <eClassifiers xsi:type="ecore:EClass" name="ConstantAssertionArgument" eSuperTypes="#//AssertionArgument">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="constant" eType="#//Constant"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="NodeValueAssertion" eSuperTypes="#//Statement">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="node" eType="#//Node"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="value" eType="#//Constant"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="UniqueDeclaration" eSuperTypes="#//Statement">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="nodes" upperBound="-1"

-        eType="#//Node" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="WildcardAssertionArgument" eSuperTypes="#//AssertionArgument"/>

-  <eClassifiers xsi:type="ecore:EClass" name="ParametricDefinition" abstract="true"

-      interface="true" eSuperTypes="#//Statement">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="bodies" upperBound="-1"

-        eType="#//Conjunction" containment="true"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="parameters" upperBound="-1"

-        eType="#//Parameter" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="RuleDefinition" eSuperTypes="#//ParametricDefinition #//NamedElement">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="kind" eType="#//RuleKind"

-        defaultValueLiteral="DIRECT"/>

-    <eStructuralFeatures xsi:type="ecore:EReference" name="action" eType="#//Action"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="Action">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="actionLiterals" upperBound="-1"

-        eType="#//ActionLiteral" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="ActionLiteral" abstract="true"/>

-  <eClassifiers xsi:type="ecore:EClass" name="ValueActionLiteral" eSuperTypes="#//ActionLiteral">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="atom" eType="#//Atom" containment="true"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="value" eType="#//LogicValue"

-        defaultValueLiteral="TRUE"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="refinement" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"

-        defaultValueLiteral="FALSE"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="DeleteActionLiteral" eSuperTypes="#//ActionLiteral">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="variableOrNode" eType="#//VariableOrNode"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="NewActionLiteral" eSuperTypes="#//ActionLiteral">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="variable" eType="#//NewVariable"

-        containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="NewVariable" eSuperTypes="#//Variable"/>

-  <eClassifiers xsi:type="ecore:EClass" name="CompoundLiteral" abstract="true" eSuperTypes="#//Literal">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="atom" eType="#//Atom" containment="true"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="ValueLiteral" eSuperTypes="#//CompoundLiteral">

-    <eStructuralFeatures xsi:type="ecore:EReference" name="values" upperBound="-1"

-        eType="#//LogicConstant" containment="true"/>

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="refinement" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EClass" name="LogicConstant">

-    <eStructuralFeatures xsi:type="ecore:EAttribute" name="value" eType="#//LogicValue"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EEnum" name="PredicateKind">

-    <eLiterals name="PARTIAL"/>

-    <eLiterals name="DIRECT" value="1"/>

-  </eClassifiers>

-  <eClassifiers xsi:type="ecore:EEnum" name="RuleKind">

-    <eLiterals name="DIRECT"/>

-  </eClassifiers>

-</ecore:EPackage>

+<?xml version="1.0" encoding="UTF-8"?>
+<ecore:EPackage xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="problem" nsURI="https://refinery.tools/emf/2021/Problem" nsPrefix="problem">
+  <eClassifiers xsi:type="ecore:EClass" name="Problem" eSuperTypes="#//NamedElement">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="nodes" upperBound="-1"
+        eType="#//Node" containment="true"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="statements" upperBound="-1"
+        eType="#//Statement" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Relation" abstract="true" eSuperTypes="#//NamedElement"/>
+  <eClassifiers xsi:type="ecore:EClass" name="ClassDeclaration" eSuperTypes="#//Relation #//Statement">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="abstract" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="superTypes" upperBound="-1"
+        eType="#//Relation"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="referenceDeclarations"
+        upperBound="-1" eType="#//ReferenceDeclaration" containment="true"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="newNode" eType="#//Node"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="ReferenceDeclaration" eSuperTypes="#//Relation">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="referenceType" eType="#//Relation"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="opposite" eType="#//ReferenceDeclaration"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="containment" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="multiplicity" eType="#//Multiplicity"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="NamedElement" abstract="true">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="PredicateDefinition" eSuperTypes="#//Relation #//ParametricDefinition">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="error" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="kind" eType="#//PredicateKind"
+        defaultValueLiteral="PARTIAL"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Parameter" eSuperTypes="#//Variable">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="parameterType" eType="#//Relation"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Variable" abstract="true" eSuperTypes="#//VariableOrNode"/>
+  <eClassifiers xsi:type="ecore:EClass" name="Conjunction" eSuperTypes="#//ExistentialQuantifier">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="literals" upperBound="-1"
+        eType="#//Literal" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Literal" abstract="true"/>
+  <eClassifiers xsi:type="ecore:EClass" name="Atom" eSuperTypes="#//Literal">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="relation" eType="#//Relation"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="transitiveClosure" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="arguments" upperBound="-1"
+        eType="#//Argument" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="ImplicitVariable" eSuperTypes="#//Variable"/>
+  <eClassifiers xsi:type="ecore:EClass" name="NegativeLiteral" eSuperTypes="#//ExistentialQuantifier #//CompoundLiteral"/>
+  <eClassifiers xsi:type="ecore:EClass" name="ExistentialQuantifier" abstract="true"
+      interface="true">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="implicitVariables" upperBound="-1"
+        eType="#//ImplicitVariable" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Assertion" eSuperTypes="#//Statement">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="relation" eType="#//Relation"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="value" eType="#//LogicValue"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="arguments" upperBound="-1"
+        eType="#//AssertionArgument" containment="true"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="default" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"
+        defaultValueLiteral="false"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Node" eSuperTypes="#//VariableOrNode"/>
+  <eClassifiers xsi:type="ecore:EEnum" name="LogicValue">
+    <eLiterals name="TRUE" literal="TRUE"/>
+    <eLiterals name="FALSE" value="1"/>
+    <eLiterals name="UNKNOWN" value="2"/>
+    <eLiterals name="ERROR" value="3"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="ScopeDeclaration" eSuperTypes="#//Statement">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="typeScopes" upperBound="-1"
+        eType="#//TypeScope" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Statement" abstract="true" interface="true"/>
+  <eClassifiers xsi:type="ecore:EClass" name="TypeScope">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="targetType" eType="#//ClassDeclaration"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="increment" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="multiplicity" eType="#//Multiplicity"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Multiplicity" abstract="true"/>
+  <eClassifiers xsi:type="ecore:EClass" name="RangeMultiplicity" eSuperTypes="#//Multiplicity">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="lowerBound" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"
+        defaultValueLiteral="0"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="upperBound" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"
+        defaultValueLiteral="-1"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="ExactMultiplicity" eSuperTypes="#//Multiplicity">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="exactValue" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"
+        defaultValueLiteral="1"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="UnboundedMultiplicity" eSuperTypes="#//Multiplicity"/>
+  <eClassifiers xsi:type="ecore:EClass" name="VariableOrNodeArgument" eSuperTypes="#//Argument">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="variableOrNode" eType="#//VariableOrNode"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="singletonVariable" eType="#//ImplicitVariable"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="EnumDeclaration" eSuperTypes="#//Relation #//Statement">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="literals" upperBound="-1"
+        eType="#//Node" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="VariableOrNode" abstract="true" eSuperTypes="#//NamedElement"/>
+  <eClassifiers xsi:type="ecore:EClass" name="Constant" abstract="true"/>
+  <eClassifiers xsi:type="ecore:EClass" name="IntConstant" eSuperTypes="#//Constant">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="intValue" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"
+        defaultValueLiteral="0"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="RealConstant" eSuperTypes="#//Constant">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="realValue" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EDouble"
+        defaultValueLiteral="0.0"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="StringConstant" eSuperTypes="#//Constant">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="stringValue" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="ConstantArgument" eSuperTypes="#//Argument">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="constant" eType="#//Constant"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Argument" abstract="true"/>
+  <eClassifiers xsi:type="ecore:EClass" name="NodeAssertionArgument" eSuperTypes="#//AssertionArgument">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="node" eType="#//Node"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="AssertionArgument" abstract="true"/>
+  <eClassifiers xsi:type="ecore:EClass" name="ConstantAssertionArgument" eSuperTypes="#//AssertionArgument">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="constant" eType="#//Constant"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="NodeValueAssertion" eSuperTypes="#//Statement">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="node" eType="#//Node"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="value" eType="#//Constant"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="IndividualDeclaration" eSuperTypes="#//Statement">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="nodes" upperBound="-1"
+        eType="#//Node" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="WildcardAssertionArgument" eSuperTypes="#//AssertionArgument"/>
+  <eClassifiers xsi:type="ecore:EClass" name="ParametricDefinition" abstract="true"
+      interface="true" eSuperTypes="#//Statement">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="bodies" upperBound="-1"
+        eType="#//Conjunction" containment="true"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="parameters" upperBound="-1"
+        eType="#//Parameter" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="RuleDefinition" eSuperTypes="#//ParametricDefinition #//NamedElement">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="kind" eType="#//RuleKind"
+        defaultValueLiteral="DIRECT"/>
+    <eStructuralFeatures xsi:type="ecore:EReference" name="action" eType="#//Action"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="Action">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="actionLiterals" upperBound="-1"
+        eType="#//ActionLiteral" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="ActionLiteral" abstract="true"/>
+  <eClassifiers xsi:type="ecore:EClass" name="ValueActionLiteral" eSuperTypes="#//ActionLiteral">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="atom" eType="#//Atom" containment="true"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="value" eType="#//LogicValue"
+        defaultValueLiteral="TRUE"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="refinement" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"
+        defaultValueLiteral="FALSE"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="DeleteActionLiteral" eSuperTypes="#//ActionLiteral">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="variableOrNode" eType="#//VariableOrNode"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="NewActionLiteral" eSuperTypes="#//ActionLiteral">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="variable" eType="#//NewVariable"
+        containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="NewVariable" eSuperTypes="#//Variable"/>
+  <eClassifiers xsi:type="ecore:EClass" name="CompoundLiteral" abstract="true" eSuperTypes="#//Literal">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="atom" eType="#//Atom" containment="true"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="ValueLiteral" eSuperTypes="#//CompoundLiteral">
+    <eStructuralFeatures xsi:type="ecore:EReference" name="values" upperBound="-1"
+        eType="#//LogicConstant" containment="true"/>
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="refinement" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EBoolean"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EClass" name="LogicConstant">
+    <eStructuralFeatures xsi:type="ecore:EAttribute" name="value" eType="#//LogicValue"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EEnum" name="PredicateKind">
+    <eLiterals name="PARTIAL"/>
+    <eLiterals name="DIRECT" value="1"/>
+  </eClassifiers>
+  <eClassifiers xsi:type="ecore:EEnum" name="RuleKind">
+    <eLiterals name="DIRECT"/>
+  </eClassifiers>
+</ecore:EPackage>
diff --git a/language-model/src/main/resources/model/problem.genmodel b/language-model/src/main/resources/model/problem.genmodel
index 3a244742..094533e7 100644
--- a/language-model/src/main/resources/model/problem.genmodel
+++ b/language-model/src/main/resources/model/problem.genmodel
@@ -1,165 +1,165 @@
-<?xml version="1.0" encoding="UTF-8"?>

-<genmodel:GenModel xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

-    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" xmlns:genmodel="http://www.eclipse.org/emf/2002/GenModel"

-    modelDirectory="/language-model/src/main/emf-gen" creationIcons="false"

-    editDirectory="/language-edit/src/main/emf-gen" editorDirectory="/org.eclipse.viatra.solver.language.model.editor/src-gen"

-    modelPluginID="language-model" modelName="Problem" rootExtendsClass="org.eclipse.emf.ecore.impl.MinimalEObjectImpl$Container"

-    codeFormatting="true" importerID="org.eclipse.emf.importer.ecore" complianceLevel="5.0"

-    copyrightFields="false" operationReflection="true" importOrganizing="true">

-  <foreignModel>problem.ecore</foreignModel>

-  <testsDirectory xsi:nil="true"/>

-  <genPackages prefix="Problem" basePackage="tools.refinery.language.model" resource="XMI"

-      disposableProviderFactory="true" fileExtensions="problem_xmi" ecorePackage="problem.ecore#/">

-    <genEnums typeSafeEnumCompatible="false" ecoreEnum="problem.ecore#//LogicValue">

-      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//LogicValue/TRUE"/>

-      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//LogicValue/FALSE"/>

-      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//LogicValue/UNKNOWN"/>

-      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//LogicValue/ERROR"/>

-    </genEnums>

-    <genEnums typeSafeEnumCompatible="false" ecoreEnum="problem.ecore#//PredicateKind">

-      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//PredicateKind/PARTIAL"/>

-      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//PredicateKind/DIRECT"/>

-    </genEnums>

-    <genEnums typeSafeEnumCompatible="false" ecoreEnum="problem.ecore#//RuleKind">

-      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//RuleKind/DIRECT"/>

-    </genEnums>

-    <genClasses ecoreClass="problem.ecore#//Problem">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Problem/nodes"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Problem/statements"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Relation"/>

-    <genClasses ecoreClass="problem.ecore#//ClassDeclaration">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ClassDeclaration/abstract"/>

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//ClassDeclaration/superTypes"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ClassDeclaration/referenceDeclarations"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ClassDeclaration/newNode"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//ReferenceDeclaration">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//ReferenceDeclaration/referenceType"/>

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//ReferenceDeclaration/opposite"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ReferenceDeclaration/containment"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ReferenceDeclaration/multiplicity"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//NamedElement">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//NamedElement/name"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//PredicateDefinition">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//PredicateDefinition/error"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//PredicateDefinition/kind"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Parameter">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//Parameter/parameterType"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Variable"/>

-    <genClasses ecoreClass="problem.ecore#//Conjunction">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Conjunction/literals"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Literal"/>

-    <genClasses ecoreClass="problem.ecore#//Atom">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//Atom/relation"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//Atom/transitiveClosure"/>

-      <genFeatures children="true" createChild="true" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//Atom/arguments"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//ImplicitVariable"/>

-    <genClasses ecoreClass="problem.ecore#//NegativeLiteral"/>

-    <genClasses ecoreClass="problem.ecore#//ExistentialQuantifier">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ExistentialQuantifier/implicitVariables"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Assertion">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//Assertion/relation"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//Assertion/value"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Assertion/arguments"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//Assertion/default"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Node"/>

-    <genClasses ecoreClass="problem.ecore#//ScopeDeclaration">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ScopeDeclaration/typeScopes"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Statement"/>

-    <genClasses ecoreClass="problem.ecore#//TypeScope">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//TypeScope/targetType"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//TypeScope/increment"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//TypeScope/multiplicity"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Multiplicity"/>

-    <genClasses ecoreClass="problem.ecore#//RangeMultiplicity">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//RangeMultiplicity/lowerBound"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//RangeMultiplicity/upperBound"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//ExactMultiplicity">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ExactMultiplicity/exactValue"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//UnboundedMultiplicity"/>

-    <genClasses ecoreClass="problem.ecore#//VariableOrNodeArgument">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//VariableOrNodeArgument/variableOrNode"/>

-      <genFeatures children="true" createChild="true" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//VariableOrNodeArgument/singletonVariable"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//EnumDeclaration">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//EnumDeclaration/literals"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//VariableOrNode"/>

-    <genClasses ecoreClass="problem.ecore#//Constant"/>

-    <genClasses ecoreClass="problem.ecore#//IntConstant">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//IntConstant/intValue"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//RealConstant">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//RealConstant/realValue"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//StringConstant">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//StringConstant/stringValue"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//ConstantArgument">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ConstantArgument/constant"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Argument"/>

-    <genClasses ecoreClass="problem.ecore#//NodeAssertionArgument">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//NodeAssertionArgument/node"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//AssertionArgument"/>

-    <genClasses ecoreClass="problem.ecore#//ConstantAssertionArgument">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ConstantAssertionArgument/constant"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//NodeValueAssertion">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//NodeValueAssertion/node"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//NodeValueAssertion/value"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//UniqueDeclaration">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//UniqueDeclaration/nodes"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//WildcardAssertionArgument"/>

-    <genClasses ecoreClass="problem.ecore#//ParametricDefinition">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ParametricDefinition/bodies"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ParametricDefinition/parameters"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//RuleDefinition">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//RuleDefinition/kind"/>

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//RuleDefinition/action"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//Action">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Action/actionLiterals"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//ActionLiteral"/>

-    <genClasses ecoreClass="problem.ecore#//ValueActionLiteral">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ValueActionLiteral/atom"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ValueActionLiteral/value"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ValueActionLiteral/refinement"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//DeleteActionLiteral">

-      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//DeleteActionLiteral/variableOrNode"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//NewActionLiteral">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//NewActionLiteral/variable"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//NewVariable"/>

-    <genClasses ecoreClass="problem.ecore#//CompoundLiteral">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//CompoundLiteral/atom"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//ValueLiteral">

-      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ValueLiteral/values"/>

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ValueLiteral/refinement"/>

-    </genClasses>

-    <genClasses ecoreClass="problem.ecore#//LogicConstant">

-      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//LogicConstant/value"/>

-    </genClasses>

-  </genPackages>

-</genmodel:GenModel>

+<?xml version="1.0" encoding="UTF-8"?>
+<genmodel:GenModel xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" xmlns:genmodel="http://www.eclipse.org/emf/2002/GenModel"
+    modelDirectory="/language-model/src/main/emf-gen" creationIcons="false"
+    editDirectory="/language-edit/src/main/emf-gen" editorDirectory="/org.eclipse.viatra.solver.language.model.editor/src-gen"
+    modelPluginID="language-model" modelName="Problem" rootExtendsClass="org.eclipse.emf.ecore.impl.MinimalEObjectImpl$Container"
+    codeFormatting="true" importerID="org.eclipse.emf.importer.ecore" complianceLevel="5.0"
+    copyrightFields="false" operationReflection="true" importOrganizing="true">
+  <foreignModel>problem.ecore</foreignModel>
+  <testsDirectory xsi:nil="true"/>
+  <genPackages prefix="Problem" basePackage="tools.refinery.language.model" resource="XMI"
+      disposableProviderFactory="true" fileExtensions="problem_xmi" ecorePackage="problem.ecore#/">
+    <genEnums typeSafeEnumCompatible="false" ecoreEnum="problem.ecore#//LogicValue">
+      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//LogicValue/TRUE"/>
+      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//LogicValue/FALSE"/>
+      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//LogicValue/UNKNOWN"/>
+      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//LogicValue/ERROR"/>
+    </genEnums>
+    <genEnums typeSafeEnumCompatible="false" ecoreEnum="problem.ecore#//PredicateKind">
+      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//PredicateKind/PARTIAL"/>
+      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//PredicateKind/DIRECT"/>
+    </genEnums>
+    <genEnums typeSafeEnumCompatible="false" ecoreEnum="problem.ecore#//RuleKind">
+      <genEnumLiterals ecoreEnumLiteral="problem.ecore#//RuleKind/DIRECT"/>
+    </genEnums>
+    <genClasses ecoreClass="problem.ecore#//Problem">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Problem/nodes"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Problem/statements"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Relation"/>
+    <genClasses ecoreClass="problem.ecore#//ClassDeclaration">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ClassDeclaration/abstract"/>
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//ClassDeclaration/superTypes"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ClassDeclaration/referenceDeclarations"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ClassDeclaration/newNode"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//ReferenceDeclaration">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//ReferenceDeclaration/referenceType"/>
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//ReferenceDeclaration/opposite"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ReferenceDeclaration/containment"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ReferenceDeclaration/multiplicity"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//NamedElement">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//NamedElement/name"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//PredicateDefinition">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//PredicateDefinition/error"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//PredicateDefinition/kind"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Parameter">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//Parameter/parameterType"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Variable"/>
+    <genClasses ecoreClass="problem.ecore#//Conjunction">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Conjunction/literals"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Literal"/>
+    <genClasses ecoreClass="problem.ecore#//Atom">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//Atom/relation"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//Atom/transitiveClosure"/>
+      <genFeatures children="true" createChild="true" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//Atom/arguments"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//ImplicitVariable"/>
+    <genClasses ecoreClass="problem.ecore#//NegativeLiteral"/>
+    <genClasses ecoreClass="problem.ecore#//ExistentialQuantifier">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ExistentialQuantifier/implicitVariables"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Assertion">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//Assertion/relation"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//Assertion/value"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Assertion/arguments"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//Assertion/default"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Node"/>
+    <genClasses ecoreClass="problem.ecore#//ScopeDeclaration">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ScopeDeclaration/typeScopes"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Statement"/>
+    <genClasses ecoreClass="problem.ecore#//TypeScope">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//TypeScope/targetType"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//TypeScope/increment"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//TypeScope/multiplicity"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Multiplicity"/>
+    <genClasses ecoreClass="problem.ecore#//RangeMultiplicity">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//RangeMultiplicity/lowerBound"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//RangeMultiplicity/upperBound"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//ExactMultiplicity">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ExactMultiplicity/exactValue"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//UnboundedMultiplicity"/>
+    <genClasses ecoreClass="problem.ecore#//VariableOrNodeArgument">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//VariableOrNodeArgument/variableOrNode"/>
+      <genFeatures children="true" createChild="true" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//VariableOrNodeArgument/singletonVariable"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//EnumDeclaration">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//EnumDeclaration/literals"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//VariableOrNode"/>
+    <genClasses ecoreClass="problem.ecore#//Constant"/>
+    <genClasses ecoreClass="problem.ecore#//IntConstant">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//IntConstant/intValue"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//RealConstant">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//RealConstant/realValue"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//StringConstant">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//StringConstant/stringValue"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//ConstantArgument">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ConstantArgument/constant"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Argument"/>
+    <genClasses ecoreClass="problem.ecore#//NodeAssertionArgument">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//NodeAssertionArgument/node"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//AssertionArgument"/>
+    <genClasses ecoreClass="problem.ecore#//ConstantAssertionArgument">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ConstantAssertionArgument/constant"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//NodeValueAssertion">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//NodeValueAssertion/node"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//NodeValueAssertion/value"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//IndividualDeclaration">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//IndividualDeclaration/nodes"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//WildcardAssertionArgument"/>
+    <genClasses ecoreClass="problem.ecore#//ParametricDefinition">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ParametricDefinition/bodies"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ParametricDefinition/parameters"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//RuleDefinition">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//RuleDefinition/kind"/>
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//RuleDefinition/action"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//Action">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//Action/actionLiterals"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//ActionLiteral"/>
+    <genClasses ecoreClass="problem.ecore#//ValueActionLiteral">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ValueActionLiteral/atom"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ValueActionLiteral/value"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ValueActionLiteral/refinement"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//DeleteActionLiteral">
+      <genFeatures notify="false" createChild="false" propertySortChoices="true" ecoreFeature="ecore:EReference problem.ecore#//DeleteActionLiteral/variableOrNode"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//NewActionLiteral">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//NewActionLiteral/variable"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//NewVariable"/>
+    <genClasses ecoreClass="problem.ecore#//CompoundLiteral">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//CompoundLiteral/atom"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//ValueLiteral">
+      <genFeatures property="None" children="true" createChild="true" ecoreFeature="ecore:EReference problem.ecore#//ValueLiteral/values"/>
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//ValueLiteral/refinement"/>
+    </genClasses>
+    <genClasses ecoreClass="problem.ecore#//LogicConstant">
+      <genFeatures createChild="false" ecoreFeature="ecore:EAttribute problem.ecore#//LogicConstant/value"/>
+    </genClasses>
+  </genPackages>
+</genmodel:GenModel>
diff --git a/language-model/src/testFixtures/java/tools/refinery/language/model/tests/ProblemTestUtil.java b/language-model/src/testFixtures/java/tools/refinery/language/model/tests/ProblemTestUtil.java
index dadc5330..d0990dc0 100644
--- a/language-model/src/testFixtures/java/tools/refinery/language/model/tests/ProblemTestUtil.java
+++ b/language-model/src/testFixtures/java/tools/refinery/language/model/tests/ProblemTestUtil.java
@@ -16,6 +16,7 @@ import tools.refinery.language.model.problem.ClassDeclaration;
 import tools.refinery.language.model.problem.Conjunction;
 import tools.refinery.language.model.problem.DeleteActionLiteral;
 import tools.refinery.language.model.problem.EnumDeclaration;
+import tools.refinery.language.model.problem.IndividualDeclaration;
 import tools.refinery.language.model.problem.Literal;
 import tools.refinery.language.model.problem.NamedElement;
 import tools.refinery.language.model.problem.NegativeLiteral;
@@ -31,7 +32,6 @@ import tools.refinery.language.model.problem.ReferenceDeclaration;
 import tools.refinery.language.model.problem.Relation;
 import tools.refinery.language.model.problem.RuleDefinition;
 import tools.refinery.language.model.problem.Statement;
-import tools.refinery.language.model.problem.UniqueDeclaration;
 import tools.refinery.language.model.problem.ValueActionLiteral;
 import tools.refinery.language.model.problem.ValueLiteral;
 import tools.refinery.language.model.problem.Variable;
@@ -148,8 +148,8 @@ public class ProblemTestUtil {
                 return named(problem.getNodes(), name);
         }
 
-        public Node uniqueNode(Problem problem, String name) {
-                var uniqueNodes = statementsOfType(problem, UniqueDeclaration.class)
+        public Node individualNode(Problem problem, String name) {
+                var uniqueNodes = statementsOfType(problem, IndividualDeclaration.class)
                                 .flatMap(declaration -> declaration.getNodes().stream());
                 return named(uniqueNodes, name);
         }
diff --git a/language-to-store/src/main/java/tools/refinery/language/mapping/PartialModelMapper.java b/language-to-store/src/main/java/tools/refinery/language/mapping/PartialModelMapper.java
index 1593a237..8f90a743 100644
--- a/language-to-store/src/main/java/tools/refinery/language/mapping/PartialModelMapper.java
+++ b/language-to-store/src/main/java/tools/refinery/language/mapping/PartialModelMapper.java
@@ -12,6 +12,7 @@ import tools.refinery.language.model.problem.Assertion;
 import tools.refinery.language.model.problem.AssertionArgument;
 import tools.refinery.language.model.problem.ClassDeclaration;
 import tools.refinery.language.model.problem.EnumDeclaration;
+import tools.refinery.language.model.problem.IndividualDeclaration;
 import tools.refinery.language.model.problem.LogicValue;
 import tools.refinery.language.model.problem.Node;
 import tools.refinery.language.model.problem.NodeAssertionArgument;
@@ -19,7 +20,6 @@ import tools.refinery.language.model.problem.PredicateDefinition;
 import tools.refinery.language.model.problem.Problem;
 import tools.refinery.language.model.problem.ReferenceDeclaration;
 import tools.refinery.language.model.problem.Statement;
-import tools.refinery.language.model.problem.UniqueDeclaration;
 import tools.refinery.store.model.Model;
 import tools.refinery.store.model.ModelStore;
 import tools.refinery.store.model.ModelStoreImpl;
@@ -183,7 +183,7 @@ public class PartialModelMapper {
                                 for (Node n : ed.getLiterals()) {
                                         enumNodeMap.put(n, nodeIter[0]++);
                                 }
-                        } else if (s instanceof UniqueDeclaration ud) {
+                        } else if (s instanceof IndividualDeclaration ud) {
                                 for (Node n : ud.getNodes()) {
                                         uniqueNodeMap.put(n, nodeIter[0]++);
                                 }
diff --git a/language-to-store/src/test/java/tools/refinery/language/mapping/tests/PartialModelMapperTest.xtend b/language-to-store/src/test/java/tools/refinery/language/mapping/tests/PartialModelMapperTest.xtend
index 52b89bae..add73c87 100644
--- a/language-to-store/src/test/java/tools/refinery/language/mapping/tests/PartialModelMapperTest.xtend
+++ b/language-to-store/src/test/java/tools/refinery/language/mapping/tests/PartialModelMapperTest.xtend
@@ -290,7 +290,7 @@ class PartialModelMapperTest {
                         error invalidTaxStatus(Person p) <->
                                 taxStatus(p, child), children(p, _q).
                         
-                        unique family.
+                        individual family.
                         Family(family).
                         members(family, anne): true.
                         members(family, bob).
@@ -322,7 +322,7 @@ class PartialModelMapperTest {
                 val anne = problem.node("anne")
                 val bob = problem.node("bob")
                 val ciri = problem.node("ciri")
-                val family = problem.uniqueNode("family")
+                val family = problem.individualNode("family")
                 val adult = problem.findEnum("TaxStatus").literal("adult")
                 
                 assertTrue(model.getDataRepresentations().contains(relationMap.get(Family)))
diff --git a/language-web/src/main/js/editor/EditorParent.ts b/language-web/src/main/js/editor/EditorParent.ts
index 2d74b863..94ca24ea 100644
--- a/language-web/src/main/js/editor/EditorParent.ts
+++ b/language-web/src/main/js/editor/EditorParent.ts
@@ -143,7 +143,7 @@ export const EditorParent = styled('div')(({ theme }) => {
         color: theme.palette.text.secondary,
       },
     },
-    '.cmt-problem-unique': {
+    '.cmt-problem-individual': {
       '&, & .cmt-variableName': {
         color: theme.palette.text.primary,
       },
diff --git a/language-web/src/main/js/index.tsx b/language-web/src/main/js/index.tsx
index dfecde37..3e077ba8 100644
--- a/language-web/src/main/js/index.tsx
+++ b/language-web/src/main/js/index.tsx
@@ -38,7 +38,7 @@ direct rule createChild(p):
     children(p, q) = true,
     taxStatus(q, child) = true.
 
-unique family.
+individual family.
 Family(family).
 members(family, anne).
 members(family, bob).
diff --git a/language-web/src/main/js/language/problem.grammar b/language-web/src/main/js/language/problem.grammar
index 8e39243f..0cbfa831 100644
--- a/language-web/src/main/js/language/problem.grammar
+++ b/language-web/src/main/js/language/problem.grammar
@@ -15,7 +15,7 @@ statement {
   } |
   EnumDefinition {
     ckw<"enum"> RelationName
-    (EnumBody { "{" sep<",", UniqueNodeName> "}" } | ".")
+    (EnumBody { "{" sep<",", IndividualNodeName> "}" } | ".")
   } |
   PredicateDefinition {
     (ckw<"error"> ckw<"pred">? | ckw<"direct">? ckw<"pred">)
@@ -32,10 +32,10 @@ statement {
     ParameterList<AssertionArgument> (":" LogicValue)? "."
   } |
   NodeValueAssertion {
-    UniqueNodeName ":" Constant "."
+    IndividualNodeName ":" Constant "."
   } |
-  UniqueDeclaration {
-    ckw<"unique"> sep<",", UniqueNodeName> "."
+  IndividualDeclaration {
+    ckw<"individual"> sep<",", IndividualNodeName> "."
   } |
   ScopeDeclaration {
     kw<"scope"> sep<",", ScopeElement> "."
@@ -87,7 +87,7 @@ RelationName { QualifiedName }
 
 RuleName { QualifiedName }
 
-UniqueNodeName { QualifiedName }
+IndividualNodeName { QualifiedName }
 
 VariableName { QualifiedName }
 
diff --git a/language-web/src/main/js/language/problemLanguageSupport.ts b/language-web/src/main/js/language/problemLanguageSupport.ts
index ab1c55f9..1dba3447 100644
--- a/language-web/src/main/js/language/problemLanguageSupport.ts
+++ b/language-web/src/main/js/language/problemLanguageSupport.ts
@@ -27,7 +27,7 @@ const parserWithMetadata = (parser as LRParser).configure({
     styleTags({
       LineComment: t.lineComment,
       BlockComment: t.blockComment,
-      'problem class enum pred rule unique scope': t.definitionKeyword,
+      'problem class enum pred rule individual scope': t.definitionKeyword,
       'abstract extends refers contains opposite error direct default': t.modifier,
       'true false unknown error': t.keyword,
       'new delete': t.operatorKeyword,
@@ -40,7 +40,7 @@ const parserWithMetadata = (parser as LRParser).configure({
       String: t.string,
       'RelationName/QualifiedName': t.typeName,
       'RuleName/QualifiedName': t.macroName,
-      'UniqueNodeName/QualifiedName': t.atom,
+      'IndividualNodeName/QualifiedName': t.atom,
       'VariableName/QualifiedName': t.variableName,
       '{ }': t.brace,
       '( )': t.paren,
diff --git a/language-web/src/test/java/tools/refinery/language/web/ProblemWebSocketServletIntegrationTest.java b/language-web/src/test/java/tools/refinery/language/web/ProblemWebSocketServletIntegrationTest.java
index d42cc15c..d34a1610 100644
--- a/language-web/src/test/java/tools/refinery/language/web/ProblemWebSocketServletIntegrationTest.java
+++ b/language-web/src/test/java/tools/refinery/language/web/ProblemWebSocketServletIntegrationTest.java
@@ -96,7 +96,7 @@ class ProblemWebSocketServletIntegrationTest {
                         case 0 -> session.getRemote().sendString(
                                         "{\"id\":\"foo\",\"request\":{\"resource\":\"test.problem\",\"serviceType\":\"update\",\"fullText\":\"class Person.\n\"}}");
                         case 3 -> session.getRemote().sendString(
-                                        "{\"id\":\"bar\",\"request\":{\"resource\":\"test.problem\",\"serviceType\":\"update\",\"requiredStateId\":\"-80000000\",\"deltaText\":\"unique q.\nnode(q).\n\",\"deltaOffset\":\"0\",\"deltaReplaceLength\":\"0\"}}");
+                                        "{\"id\":\"bar\",\"request\":{\"resource\":\"test.problem\",\"serviceType\":\"update\",\"requiredStateId\":\"-80000000\",\"deltaText\":\"individual q.\nnode(q).\n\",\"deltaOffset\":\"0\",\"deltaReplaceLength\":\"0\"}}");
                         case 5 -> session.close();
                         }
                 }
diff --git a/language-web/src/test/java/tools/refinery/language/web/xtext/servlet/TransactionExecutorTest.java b/language-web/src/test/java/tools/refinery/language/web/xtext/servlet/TransactionExecutorTest.java
index 975d120c..3229597e 100644
--- a/language-web/src/test/java/tools/refinery/language/web/xtext/servlet/TransactionExecutorTest.java
+++ b/language-web/src/test/java/tools/refinery/language/web/xtext/servlet/TransactionExecutorTest.java
@@ -79,7 +79,7 @@ class TransactionExecutorTest {
                 var stateId = updateFullText();
                 var responseHandler = sendRequestAndWaitForAllResponses(
                                 new XtextWebRequest("bar", Map.of("resource", RESOURCE_NAME, "serviceType", "update", "requiredStateId",
-                                                stateId, "deltaText", "unique q.\nnode(q).\n<invalid text>\n", "deltaOffset", "0", "deltaReplaceLength", "0")));
+                                                stateId, "deltaText", "individual q.\nnode(q).\n<invalid text>\n", "deltaOffset", "0", "deltaReplaceLength", "0")));
 
                 var captor = newCaptor();
                 verify(responseHandler, times(3)).onResponse(captor.capture());
@@ -92,7 +92,7 @@ class TransactionExecutorTest {
                 var stateId = updateFullText();
                 var responseHandler = sendRequestAndWaitForAllResponses(
                                 new XtextWebRequest("bar", Map.of("resource", RESOURCE_NAME, "serviceType", "update", "requiredStateId",
-                                                stateId, "deltaText", "unique q.\nnode(q).\n", "deltaOffset", "0", "deltaReplaceLength", "0")));
+                                                stateId, "deltaText", "individual q.\nnode(q).\n", "deltaOffset", "0", "deltaReplaceLength", "0")));
 
                 var captor = newCaptor();
                 verify(responseHandler, times(2)).onResponse(captor.capture());
diff --git a/language/src/main/java/tools/refinery/language/Problem.xtext b/language/src/main/java/tools/refinery/language/Problem.xtext
index 0fa47d63..b7562759 100644
--- a/language/src/main/java/tools/refinery/language/Problem.xtext
+++ b/language/src/main/java/tools/refinery/language/Problem.xtext
@@ -9,7 +9,7 @@ Problem:
 
 Statement:
         ClassDeclaration | EnumDeclaration | PredicateDefinition | RuleDefinition | Assertion | NodeValueAssertion | ScopeDeclaration |
-        UniqueDeclaration;
+        IndividualDeclaration;
 
 ClassDeclaration:
         abstract?="abstract"? "class"
@@ -173,8 +173,8 @@ RangeMultiplicity:
 ExactMultiplicity:
         exactValue=INT;
 
-UniqueDeclaration:
-        "unique" nodes+=EnumLiteral ("," nodes+=EnumLiteral)* ".";
+IndividualDeclaration:
+        "individual" nodes+=EnumLiteral ("," nodes+=EnumLiteral)* ".";
 
 UpperBound returns ecore::EInt:
         INT | "*";
@@ -184,7 +184,7 @@ QualifiedName hidden():
 
 Identifier:
         ID | "true" | "false" | "unknown" | "error" | "class" | "abstract" | "extends" | "enum" | "pred" |
-        "unique" | "problem" | "new" | "delete";
+        "individual" | "problem" | "new" | "delete" | "direct" | "rule";
 
 Integer returns ecore::EInt hidden():
         "-"? INT;
diff --git a/language/src/main/java/tools/refinery/language/resource/ProblemLocationInFileProvider.java b/language/src/main/java/tools/refinery/language/resource/ProblemLocationInFileProvider.java
index b51de05d..7aa75833 100644
--- a/language/src/main/java/tools/refinery/language/resource/ProblemLocationInFileProvider.java
+++ b/language/src/main/java/tools/refinery/language/resource/ProblemLocationInFileProvider.java
@@ -21,7 +21,7 @@ public class ProblemLocationInFileProvider extends DefaultLocationInFileProvider
         }
 
         protected ITextRegion getNodeTextRegion(Node node, RegionDescription query) {
-                if (ProblemUtil.isUniqueNode(node)) {
+                if (ProblemUtil.isIndividualNode(node)) {
                         return super.doGetTextRegion(node, query);
                 }
                 if (ProblemUtil.isNewNode(node)) {
diff --git a/language/src/main/java/tools/refinery/language/resource/ProblemResourceDescriptionStrategy.java b/language/src/main/java/tools/refinery/language/resource/ProblemResourceDescriptionStrategy.java
index e745b6a5..f86ebd38 100644
--- a/language/src/main/java/tools/refinery/language/resource/ProblemResourceDescriptionStrategy.java
+++ b/language/src/main/java/tools/refinery/language/resource/ProblemResourceDescriptionStrategy.java
@@ -83,7 +83,7 @@ public class ProblemResourceDescriptionStrategy extends DefaultResourceDescripti
                 }
                 if (eObject instanceof Node node) {
                         // Only enum literals and new nodes are visible across problem files.
-                        return ProblemUtil.isUniqueNode(node) || ProblemUtil.isNewNode(node);
+                        return ProblemUtil.isIndividualNode(node) || ProblemUtil.isNewNode(node);
                 }
                 return true;
         }
diff --git a/language/src/main/java/tools/refinery/language/validation/ProblemValidator.java b/language/src/main/java/tools/refinery/language/validation/ProblemValidator.java
index dfd386f5..3c10d39e 100644
--- a/language/src/main/java/tools/refinery/language/validation/ProblemValidator.java
+++ b/language/src/main/java/tools/refinery/language/validation/ProblemValidator.java
@@ -27,7 +27,7 @@ public class ProblemValidator extends AbstractProblemValidator {
 
         public static final String SINGLETON_VARIABLE_ISSUE = ISSUE_PREFIX + "SINGLETON_VARIABLE";
 
-        public static final String NON_UNIQUE_NODE_ISSUE = ISSUE_PREFIX + "NON_UNIQUE_NODE";
+        public static final String NON_INDIVIDUAL_NODE_ISSUE = ISSUE_PREFIX + "NON_INDIVIDUAL_NODE";
 
         @Inject
         private ReferenceCounter referenceCounter;
@@ -51,12 +51,12 @@ public class ProblemValidator extends AbstractProblemValidator {
         @Check
         public void checkNonUniqueNode(VariableOrNodeArgument argument) {
                 var variableOrNode = argument.getVariableOrNode();
-                if (variableOrNode instanceof Node node && !ProblemUtil.isUniqueNode(node)) {
+                if (variableOrNode instanceof Node node && !ProblemUtil.isIndividualNode(node)) {
                         var name = node.getName();
-                        var message = "Only unique nodes can be referenced in predicates. Mark '%s' as unique with the declaration 'unique %s.'"
+                        var message = "Only individual nodes can be referenced in predicates. Mark '%s' as individual with the declaration 'individual %s.'"
                                         .formatted(name, name);
                         error(message, argument, ProblemPackage.Literals.VARIABLE_OR_NODE_ARGUMENT__VARIABLE_OR_NODE,
-                                        INSIGNIFICANT_INDEX, NON_UNIQUE_NODE_ISSUE);
+                                        INSIGNIFICANT_INDEX, NON_INDIVIDUAL_NODE_ISSUE);
                 }
         }
 }
diff --git a/language/src/test/java/tools/refinery/language/tests/ProblemParsingTest.xtend b/language/src/test/java/tools/refinery/language/tests/ProblemParsingTest.xtend
index 99cf0a86..9e357529 100644
--- a/language/src/test/java/tools/refinery/language/tests/ProblemParsingTest.xtend
+++ b/language/src/test/java/tools/refinery/language/tests/ProblemParsingTest.xtend
@@ -46,7 +46,7 @@ class ProblemParsingTest {
                         error invalidTaxStatus(Person p) <->
                                 taxStatus(p, child), children(p, _q).
                         
-                        unique family.
+                        individual family.
                         Family(family).
                         members(family, anne): true.
                         members(family, bob).
diff --git a/language/src/test/java/tools/refinery/language/tests/scoping/NodeScopingTest.xtend b/language/src/test/java/tools/refinery/language/tests/scoping/NodeScopingTest.xtend
index 5ff7a2c9..5f669847 100644
--- a/language/src/test/java/tools/refinery/language/tests/scoping/NodeScopingTest.xtend
+++ b/language/src/test/java/tools/refinery/language/tests/scoping/NodeScopingTest.xtend
@@ -77,50 +77,50 @@ class NodeScopingTest {
         }
 
         @ParameterizedTest
-        @MethodSource("uniqueNodeReferenceSource")
-        def void uniqueNodeInAssertionTest(String qualifiedNamePrefix, boolean namedProblem) {
+        @MethodSource("individualNodeReferenceSource")
+        def void individualNodeInAssertionTest(String qualifiedNamePrefix, boolean namedProblem) {
                 val it = parseHelper.parse('''
                         «IF namedProblem»problem test.«ENDIF»
-                        unique a, b.
+                        individual a, b.
                         pred predicate(node x, node y) <-> node(x).
                         predicate(«qualifiedNamePrefix»a, «qualifiedNamePrefix»a).
                         ?predicate(«qualifiedNamePrefix»a, «qualifiedNamePrefix»b).
                 ''')
                 assertThat(errors, empty)
                 assertThat(nodeNames, empty)
-                assertThat(assertion(0).arg(0).node, equalTo(uniqueNode('a')))
-                assertThat(assertion(0).arg(1).node, equalTo(uniqueNode('a')))
-                assertThat(assertion(1).arg(0).node, equalTo(uniqueNode('a')))
-                assertThat(assertion(1).arg(1).node, equalTo(uniqueNode('b')))
+                assertThat(assertion(0).arg(0).node, equalTo(individualNode('a')))
+                assertThat(assertion(0).arg(1).node, equalTo(individualNode('a')))
+                assertThat(assertion(1).arg(0).node, equalTo(individualNode('a')))
+                assertThat(assertion(1).arg(1).node, equalTo(individualNode('b')))
         }
 
         @ParameterizedTest
-        @MethodSource("uniqueNodeReferenceSource")
-        def void uniqueNodeInNodeValueAssertionTest(String qualifiedNamePrefix, boolean namedProblem) {
+        @MethodSource("individualNodeReferenceSource")
+        def void individualNodeInNodeValueAssertionTest(String qualifiedNamePrefix, boolean namedProblem) {
                 val it = parseHelper.parse('''
                         «IF namedProblem»problem test.«ENDIF»
-                        unique a.
+                        individual a.
                         «qualifiedNamePrefix»a: 16.
                 ''')
                 assertThat(errors, empty)
                 assertThat(nodeNames, empty)
-                assertThat(nodeValueAssertion(0).node, equalTo(uniqueNode('a')))
+                assertThat(nodeValueAssertion(0).node, equalTo(individualNode('a')))
         }
 
         @ParameterizedTest
-        @MethodSource("uniqueNodeReferenceSource")
-        def void uniqueNodeInPredicateTest(String qualifiedNamePrefix, boolean namedProblem) {
+        @MethodSource("individualNodeReferenceSource")
+        def void individualNodeInPredicateTest(String qualifiedNamePrefix, boolean namedProblem) {
                 val it = parseHelper.parse('''
                         «IF namedProblem»problem test.«ENDIF»
-                        unique b.
+                        individual b.
                         pred predicate(node a) <-> node(«qualifiedNamePrefix»b).
                 ''')
                 assertThat(errors, empty)
                 assertThat(nodeNames, empty)
-                assertThat(pred("predicate").conj(0).lit(0).arg(0).node, equalTo(uniqueNode("b")))
+                assertThat(pred("predicate").conj(0).lit(0).arg(0).node, equalTo(individualNode("b")))
         }
         
-        static def uniqueNodeReferenceSource() {
+        static def individualNodeReferenceSource() {
                 Stream.of(
                         Arguments.of("", false),
                         Arguments.of("", true),