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diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/migration/NamespaceMigrationStep.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/migration/NamespaceMigrationStep.java
new file mode 100644
index 000000000..d6da4e906
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/migration/NamespaceMigrationStep.java
@@ -0,0 +1,91 @@
+/*******************************************************************************
+ * Copyright (c) 2012 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.layer0.migration;
+
+import gnu.trove.set.hash.TIntHashSet;
+
+import java.util.ArrayList;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.simantics.databoard.Bindings;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Session;
+import org.simantics.db.common.utils.ListUtils;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.graph.query.Path;
+import org.simantics.graph.query.TransferableGraphConversion;
+import org.simantics.graph.query.UriUtils;
+import org.simantics.graph.refactoring.GraphRefactoringException;
+import org.simantics.graph.refactoring.GraphRefactoringUtils;
+import org.simantics.graph.refactoring.MappingSpecification;
+import org.simantics.graph.refactoring.MappingSpecification.MappingRule;
+import org.simantics.graph.representation.TransferableGraph1;
+import org.simantics.graph.store.IdentityStore;
+import org.simantics.layer0.Layer0;
+
+public class NamespaceMigrationStep implements MigrationStep {
+	
+    final ArrayList<MappingRule> rules;
+    
+	public NamespaceMigrationStep(ReadGraph graph, Resource step) throws DatabaseException {
+		rules = new ArrayList<MappingRule>();
+		Layer0 L0 = Layer0.getInstance(graph);
+		for(Resource prefix : ListUtils.toList(graph, step)) {
+			String base = graph.getPossibleRelatedValue(prefix, L0.NamespaceMigrationStep_Prefix_base, Bindings.STRING);
+			String from = graph.getPossibleRelatedValue(prefix, L0.NamespaceMigrationStep_Prefix_from, Bindings.STRING);
+			String to = graph.getPossibleRelatedValue(prefix, L0.NamespaceMigrationStep_Prefix_to, Bindings.STRING);
+			if(from != null && to != null) {
+				Path fromURI = UriUtils.uriToPath(base+from);
+				Path toURI = UriUtils.uriToPath(base+to);
+				if(fromURI != null && toURI != null)
+					rules.add(new MappingRule(fromURI, toURI));
+				else
+					System.err.println("Namespace migration uri formation error: base " + base + " from " + from + " to " + to);
+			}
+		}
+	}
+
+    @Override
+    public void applyTo(IProgressMonitor monitor, Session session, MigrationState state) throws DatabaseException {
+    	
+        TransferableGraph1 tg = MigrationUtils.getTG(session, state); 
+                
+        try {
+            MappingSpecification mappingSpec = new MappingSpecification(rules);
+            boolean fixed = GraphRefactoringUtils.fixIncorrectRoot(tg.identities);
+            System.err.println("fixed=" + fixed);
+            IdentityStore idStore = TransferableGraphConversion.extractIdentities(tg);
+            idStore.printChildMap();
+//            System.err.println("ids: " + idStore);
+//            System.err.println("rc: " + tg.resourceCount);
+//            System.err.println("idStore: " + idStore.toArray().length);
+            TIntHashSet parentsAffected = new TIntHashSet(); 
+            GraphRefactoringUtils.refactor(tg, idStore, mappingSpec, parentsAffected);
+//
+            tg.resourceCount = idStore.getResourceCount();
+            
+            tg.identities = idStore.toArray();
+
+            if(fixed)
+                GraphRefactoringUtils.unfixIncorrectRoot(tg.identities);
+
+            System.err.println("rc2: " + tg.resourceCount);
+//            System.err.println("idStore2: " + idStore.toArray().length);
+
+        } catch (GraphRefactoringException e) {
+            e.printStackTrace();
+        }
+    	
+    }
+    
+}