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diff --git a/bundles/org.simantics.db/src/org/simantics/db/ConverterComputationalValue.java b/bundles/org.simantics.db/src/org/simantics/db/ConverterComputationalValue.java
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+/*******************************************************************************
+ * Copyright (c) 2018 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db;
+
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.scl.runtime.function.Function1;
+
+/**
+ * @author Antti Villberg
+ * @since 1.36.0
+ */
+public interface ConverterComputationalValue extends ComputationalValue {
+
+    /**
+     * This computes the expression function that shall be called with given context
+     * as defined in
+     * {@link ReadGraph#getRelatedValue2(Resource, Resource, Object, org.simantics.databoard.binding.Binding)}.
+     *
+     * <p>
+     * Context can be Resource (literal) or Variable. With Resource context this
+     * gets called with <code>(null, null, literal resource)</code>. With Variable
+     * property context this gets called with
+     * <code>(represents of parent, represents, predicate resource)</code>.
+     */
+    Function1<Object,Object> getFunction(ReadGraph graph, Resource s, Resource o, Resource p) throws DatabaseException;
+
+}