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diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/internal/RandomAccessValueSupport.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/internal/RandomAccessValueSupport.java
new file mode 100644
index 000000000..a86555827
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/internal/RandomAccessValueSupport.java
@@ -0,0 +1,54 @@
+package org.simantics.db.impl.internal;
+
+import java.util.Collection;
+
+import org.simantics.db.ExternalValueSupport;
+import org.simantics.db.Resource;
+import org.simantics.db.Session;
+import org.simantics.utils.datastructures.Pair;
+
+/**
+ * A database {@link Session} service for registering and retrieving random
+ * access binary instances related to a session.
+ * 
+ * <p>
+ * This service is internal to the implementation and must not be used
+ * elsewhere.
+ * </p>
+ * 
+ * @author Tuukka Lehtonen
+ * 
+ * @see ExternalValueSupport
+ */
+public interface RandomAccessValueSupport {
+
+	/**
+	 * Registers the specified value with the specified resource.
+	 * 
+	 * @param resource
+	 * @param data
+	 * @throws IllegalStateException
+	 *             if a previous registration already exists for the specified
+	 *             resource
+	 */
+	void put(Resource resource, ResourceData data);
+
+	/**
+	 * @param Resource
+	 * @return currently registered value attached to the specified resource
+	 */
+	ResourceData get(Resource resource);
+
+	/**
+	 * @return currently registered entries
+	 */
+	Collection<Pair<Resource, ResourceData>> entries();
+
+	/**
+	 * Removes all value registrations from this registry.
+	 * 
+	 * @return the set of previously registered values
+	 */
+	Collection<Pair<Resource, ResourceData>> removeAll();
+
+}