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diff --git a/bundles/org.simantics.db/src/org/simantics/db/service/ClusterBuilder.java b/bundles/org.simantics.db/src/org/simantics/db/service/ClusterBuilder.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 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:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.service;
+
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.serialization.Serializer;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteOnlyGraph;
+import org.simantics.db.exception.DatabaseException;
+
+
+
+/**
+ * @author Antti Villberg
+ */
+public interface ClusterBuilder {
+	
+	public interface ResourceHandle {
+		void addStatement(StatementHandle handle);
+		void addStatement(ResourceHandle predicate, ResourceHandle object);
+		void addStatement(WriteOnlyGraph graph, ResourceHandle predicate, ResourceHandle object) throws DatabaseException;
+		void addValue(WriteOnlyGraph graph, byte[] value) throws DatabaseException;
+		void addValue(Object value, Binding binding);
+		void addValue(Object value, Serializer serializer);
+		void applyPredicate(Object change);
+		void applyObject(Object change);
+		Resource resource(SerialisationSupport support);
+	}
+	
+	public interface StatementHandle {
+		void apply(Object change);
+	}
+	
+	void newCluster() throws DatabaseException;
+	ResourceHandle newResource() throws DatabaseException;
+//	ResourceHandle newResource(ResourceHandle handle) throws DatabaseException;
+	ResourceHandle resource(Resource res) throws DatabaseException;
+//	StatementHandle newStatement(Resource predicate, Resource object) throws DatabaseException;
+	StatementHandle newStatement(ResourceHandle predicate, ResourceHandle object) throws DatabaseException;
+	
+	
+
+//	<T, I> T createMap(Class<I> clazz);
+//	Set<Resource> createSet();
+//	Collection<Resource> createList();
+//	Collection<Statement> createStatementList();
+
+}