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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/query/QMapping.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/query/QMapping.java
new file mode 100644
index 000000000..fa0794fb4
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/query/QMapping.java
@@ -0,0 +1,96 @@
+package org.simantics.scl.compiler.elaboration.query;
+
+import gnu.trove.map.hash.TObjectIntHashMap;
+import gnu.trove.set.hash.THashSet;
+import gnu.trove.set.hash.TIntHashSet;
+
+import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;
+import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
+import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
+import org.simantics.scl.compiler.elaboration.expressions.Expression;
+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.UnsolvableQueryException;
+import org.simantics.scl.compiler.elaboration.rules.MappingRelation;
+import org.simantics.scl.compiler.errors.Locations;
+import org.simantics.scl.compiler.types.Type;
+
+public class QMapping extends Query {
+    public final MappingRelation mappingRelation;
+    public final Expression[] parameters;
+    
+    public QMapping(MappingRelation mappingRelation, Expression[] parameters) {
+        this.mappingRelation = mappingRelation;
+        this.parameters = parameters;
+    }
+
+    @Override
+    public void collectFreeVariables(THashSet<Variable> vars) {
+        for(Expression parameter : parameters)
+            parameter.collectFreeVariables(vars);
+    }
+
+    @Override
+    public void collectRefs(TObjectIntHashMap<Object> allRefs,
+            TIntHashSet refs) {
+        for(Expression parameter : parameters)
+            parameter.collectRefs(allRefs, refs);
+    }
+
+    @Override
+    public void collectVars(TObjectIntHashMap<Variable> allVars,
+            TIntHashSet vars) {
+        for(Expression parameter : parameters)
+            parameter.collectVars(allVars, vars);
+    }
+
+    @Override
+    public void checkType(TypingContext context) {
+        // Check parameter types
+        Type[] parameterTypes = mappingRelation.parameterTypes;
+        if(parameterTypes.length != parameters.length)
+            context.getErrorLog().log(location, "Relation is applied with wrong number of parameters.");
+        else
+            for(int i=0;i<parameters.length;++i)
+                parameters[i] = parameters[i].checkType(context, parameterTypes[i]);
+    }
+
+    @Override
+    public void collectConstraints(ConstraintCollectionContext context)
+            throws UnsolvableQueryException {
+        throw new InternalCompilerError();
+    }
+
+    @Override
+    public Query replace(ReplaceContext context) {
+        return new QMapping(mappingRelation,
+                Expression.replace(context, parameters));
+    }
+
+    @Override
+    public void setLocationDeep(long loc) {
+        if(location == Locations.NO_LOCATION) {
+            location = loc;
+            for(Expression parameter : parameters)
+                parameter.setLocationDeep(loc);
+        }
+    }
+
+    @Override
+    public void accept(QueryVisitor visitor) {
+        visitor.visit(this);
+    }
+
+    @Override
+    public void forVariables(VariableProcedure procedure) {
+        for(Expression parameter : parameters)
+            parameter.forVariables(procedure);
+    }
+    
+    @Override
+    public Query accept(QueryTransformer transformer) {
+        return transformer.transform(this);
+    }
+}