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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/query/QExists.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/query/QExists.java
new file mode 100644
index 000000000..cdb0a5726
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/query/QExists.java
@@ -0,0 +1,107 @@
+package org.simantics.scl.compiler.elaboration.query;
+
+import gnu.trove.map.hash.THashMap;
+import gnu.trove.set.hash.THashSet;
+
+import java.util.Collection;
+import java.util.Set;
+
+import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
+import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
+import org.simantics.scl.compiler.elaboration.expressions.EVariable;
+import org.simantics.scl.compiler.elaboration.expressions.QueryTransformer;
+import org.simantics.scl.compiler.elaboration.expressions.Variable;
+import org.simantics.scl.compiler.elaboration.expressions.VariableProcedure;
+import org.simantics.scl.compiler.elaboration.query.compilation.ConstraintCollectionContext;
+import org.simantics.scl.compiler.elaboration.query.compilation.DerivateException;
+import org.simantics.scl.compiler.elaboration.query.compilation.UnsolvableQueryException;
+import org.simantics.scl.compiler.elaboration.relations.LocalRelation;
+import org.simantics.scl.compiler.elaboration.relations.SCLRelation;
+import org.simantics.scl.compiler.types.Types;
+import org.simantics.scl.compiler.types.kinds.Kinds;
+
+public class QExists extends QAbstractModifier {
+    Variable[] variables;
+    
+    public QExists(Variable[] variables, Query query) {
+        super(query);
+        this.variables = variables;
+    }
+    
+    public QExists(Collection<Variable> variables, Query query) {
+        this(variables.toArray(new Variable[variables.size()]), query);
+    }
+
+    @Override
+    public void collectFreeVariables(THashSet<Variable> vars) {
+        super.collectFreeVariables(vars);
+        for(Variable variable : variables)
+            vars.remove(variable);
+    }
+
+    @Override
+    public void checkType(TypingContext context) {
+        for(Variable var : variables)
+            var.setType(Types.metaVar(Kinds.STAR));
+        super.checkType(context);
+    }
+
+    @Override
+    public void collectConstraints(ConstraintCollectionContext context) throws UnsolvableQueryException {
+        for(Variable variable : variables)
+            context.addVariable(variable);
+        query.collectConstraints(context);
+    }
+    
+    @Override
+    public Diff[] derivate(THashMap<LocalRelation, Diffable> diffables) throws DerivateException {
+        Diff[] result = query.derivate(diffables);
+        for(int i=0;i<result.length;++i)
+            result[i].query = new QExists(variables, result[i].query);
+        return result;
+    }
+
+    @Override
+    public Query replace(ReplaceContext context) {
+        Variable[] newVariables = new Variable[variables.length];
+        for(int i=0;i<variables.length;++i) {
+            Variable variable = variables[i];
+            Variable newVariable = new Variable(variable.getName(), variable.getType().replace(context.tvarMap)); 
+            newVariables[i] = newVariable;
+            context.varMap.put(variable, new EVariable(newVariable));
+        }
+        Query result = new QExists(newVariables, query.replace(context));
+        for(Variable v : variables)
+            context.varMap.remove(v);
+        return result;
+    }
+    
+    @Override
+    public Query removeRelations(Set<SCLRelation> relations) {
+        Query newQuery = query.removeRelations(relations);
+        if(newQuery == query)
+            return this;
+        else if(newQuery == EMPTY_QUERY)
+            return EMPTY_QUERY;
+        else
+            return new QExists(variables, newQuery);
+    }
+    
+    @Override
+    public void accept(QueryVisitor visitor) {
+        visitor.visit(this);
+    }
+    
+    @Override
+    public void forVariables(VariableProcedure procedure) {
+        for(Variable variable : variables)
+            procedure.execute(location, variable);
+        super.forVariables(procedure);
+    }
+    
+    @Override
+    public Query accept(QueryTransformer transformer) {
+        return transformer.transform(this);
+    }
+
+}