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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/java/ExecuteRelation.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/java/ExecuteRelation.java
new file mode 100644
index 000000000..10f36193e
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/java/ExecuteRelation.java
@@ -0,0 +1,74 @@
+package org.simantics.scl.compiler.elaboration.java;
+
+import org.simantics.scl.compiler.elaboration.expressions.EApply;
+import org.simantics.scl.compiler.elaboration.expressions.Expression;
+import org.simantics.scl.compiler.elaboration.expressions.Expressions;
+import org.simantics.scl.compiler.elaboration.expressions.Variable;
+import org.simantics.scl.compiler.elaboration.query.compilation.EnforcingContext;
+import org.simantics.scl.compiler.elaboration.query.compilation.QueryCompilationContext;
+import org.simantics.scl.compiler.elaboration.relations.AbstractRelation;
+import org.simantics.scl.compiler.types.TVar;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+import org.simantics.scl.compiler.types.kinds.Kinds;
+
+public class ExecuteRelation extends AbstractRelation {
+    int phase;
+    
+    public ExecuteRelation(int phase) {
+        this.phase = phase;
+    }
+    
+    private static TVar A = Types.var(Kinds.STAR);
+    private static TVar E = Types.var(Kinds.EFFECT);
+    private static TVar[] TYPE_VARIABLES = new TVar[] {A, E};
+    
+    @Override
+    public TVar[] getTypeVariables() {
+        return TYPE_VARIABLES;
+    }
+    
+    private static final Type[] PARAMETER_TYPES = new Type[] {Types.functionE(Types.PUNIT, E, A)};
+
+    @Override
+    public Type[] getParameterTypes() {
+        return PARAMETER_TYPES;
+    }
+
+    @Override
+    public int getPhase() {
+        return phase;
+    }
+    
+    @Override
+    public double getSelectivity(int boundVariables) {
+        return Double.POSITIVE_INFINITY;
+    }
+    
+    @Override
+    public int getRequiredVariablesMask() {
+        return B;
+    }
+
+    @Override
+    public void generate(long location,
+            QueryCompilationContext context,
+            Type[] typeParameters, Variable[] parameters, int boundVariables) {
+        throw new IllegalArgumentException();
+    }
+
+    @Override
+    public Expression generateEnforce(long location, EnforcingContext context,
+            Type[] typeParameters,
+            Variable[] parameters) {
+        return new EApply(
+                Expressions.var(parameters[0]),
+                Expressions.punit());
+    }
+    
+    @Override
+    public String toString() {
+        return "Execute";
+    }
+    
+}