Transform all header values to String.

tools.descartes.prisma.core.tests/src/tools/descartes/prisma/core/TestModelRepository.java

@@ -126,13 +126,13 @@ public class TestModelRepository implements ModelRepository {
 	}
 
 	@Override
-	public Object getInstance(Object id) {
-		return id;
+	public Object getInstance(String id) {
+		return null;
 	}
 
 	@Override
-	public Object getInstanceID(Object object) {
-		return object;
+	public String getInstanceID(Object object) {
+		return object.toString();
 	}
 
 	@Override

tools.descartes.prisma.core/src/tools/descartes/prisma/core/ModelRepository.java

@@ -33,7 +33,7 @@ public interface ModelRepository {
 
 	public <T> List<T> query(String query, Object context, Class<T> resultType);
 
-	public Object getInstanceID(Object object);
+	public String getInstanceID(Object object);
 
-	public Object getInstance(Object id);
+	public Object getInstance(String id);
 }

tools.descartes.prisma.core/src/tools/descartes/prisma/core/impl/CDOModelRepository.java

@@ -7,7 +7,7 @@ import java.util.List;
 import java.util.Map;
 
 import org.eclipse.emf.cdo.CDOObject;
-import org.eclipse.emf.cdo.common.id.CDOID;
+import org.eclipse.emf.cdo.common.id.CDOIDUtil;
 import org.eclipse.emf.cdo.eresource.CDOResourceFolder;
 import org.eclipse.emf.cdo.eresource.CDOResourceNode;
 import org.eclipse.emf.cdo.transaction.CDOTransaction;
@@ -174,13 +174,13 @@ public class CDOModelRepository implements ModelRepository {
 	}
 
 	@Override
-	public Object getInstanceID(Object object) {
-		return ((CDOObject) object).cdoID();
+	public String getInstanceID(Object object) {
+		return ((CDOObject) object).cdoID().toURIFragment();
 	}
 
 	@Override
-	public Object getInstance(Object id) {
-		return readOnlyView.getObject((CDOID) id);
+	public Object getInstance(String id) {
+		return readOnlyView.getObject(CDOIDUtil.read(id));
 	}
 
 	public Transaction createTransaction() {

tools.descartes.prisma.core/src/tools/descartes/prisma/core/scopes/ModelNotification.java

@@ -36,12 +36,12 @@ public class ModelNotification extends HashMap<String, Object> {
 			Object instance) {
 		this.repository = repository;
 		put(NOTIFICATION_TYPE, notificationType);
-		put(INSTANCE_TYPE, instanceType);
+		put(INSTANCE_TYPE, instanceType.getName());
 		put(INSTANCE_ID, repository.getInstanceID(instance));
 	}
 
 	public EObject getInstance() {
-		return (EObject) repository.getInstance(get(INSTANCE_ID));
+		return (EObject) repository.getInstance((String) get(INSTANCE_ID));
 	}
 
 	public String[] getDestinationScopes() {