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diff --git a/bundles/org.simantics.graph.compiler/src/org/simantics/graph/compiler/internal/procedures/ConvertPreValues.java b/bundles/org.simantics.graph.compiler/src/org/simantics/graph/compiler/internal/procedures/ConvertPreValues.java
new file mode 100644
index 000000000..ca1588ff0
--- /dev/null
+++ b/bundles/org.simantics.graph.compiler/src/org/simantics/graph/compiler/internal/procedures/ConvertPreValues.java
@@ -0,0 +1,80 @@
+package org.simantics.graph.compiler.internal.procedures;
+
+import gnu.trove.list.array.TIntArrayList;
+import gnu.trove.map.hash.TIntObjectHashMap;
+
+import java.util.Collection;
+
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.type.Datatype;
+import org.simantics.graph.compiler.internal.store.PreValueStore;
+import org.simantics.graph.query.IDataTypeQuery;
+import org.simantics.graph.query.IGraph;
+import org.simantics.graph.query.Paths;
+import org.simantics.graph.store.GraphStore;
+import org.simantics.graph.store.StatementStore;
+import org.simantics.graph.store.ValueStore;
+import org.simantics.ltk.Problem;
+
+public class ConvertPreValues implements Runnable {
+
+	IGraph cg;
+	GraphStore store;
+	Collection<Problem> problems;
+	
+	public ConvertPreValues(IGraph cg, GraphStore store,
+			Collection<Problem> problems) {
+		this.cg = cg;
+		this.store = store;
+		this.problems = problems;
+	}
+
+	@Override
+	public void run() {
+		PreValueStore preValues = store.getStore(PreValueStore.class);
+		preValues.convertPreValues(store.values, new IDataTypeQuery() {	
+			
+		    Paths paths = cg.getPaths();
+			StatementStore statements = store.statements;
+			ValueStore values = store.values;
+			int HasDatatype = store.identities.createPathToId(paths.HasDatatype);
+			int InstanceOf = store.identities.createPathToId(paths.InstanceOf);
+			
+			@Override
+			public Binding getDataType(int id) {
+				TIntArrayList objects = statements.getObjects(id, HasDatatype);
+				if(objects.isEmpty()) {
+					objects = statements.getObjects(id, InstanceOf);
+					for(int i=0;i<objects.size();++i) {
+						int type = objects.getQuick(i);
+						Binding binding = getDatatypeForType(type);
+						if(binding != null)
+							return binding;
+					}
+					return null;
+				}
+				else {
+					Datatype dt = values.getDatatypeValue(objects.getQuick(0));
+					if(dt == null)
+						return null;
+					else
+						return Bindings.getBinding(dt);
+				}				
+			}
+
+			TIntObjectHashMap<Binding> typeBindingCache = new TIntObjectHashMap<Binding>();
+			private Binding getDatatypeForType(int type) {
+				if(typeBindingCache.containsKey(type))
+					return typeBindingCache.get(type);
+				else {
+					Datatype dt = cg.getAssertedDatatype(store.idToRes(type));
+					Binding binding = dt == null ? null : Bindings.getBinding(dt);
+					typeBindingCache.put(type, binding);
+					return binding;
+				}				
+			}
+		}, problems);
+	}	
+
+}