if (input instanceof DiagramEditorInput) {
ResourceSet resourceSet = getEditingDomain().getResourceSet();
Bpmn2ResourceImpl bpmnResource = (Bpmn2ResourceImpl) resourceSet.createResource(modelUri,
"org.eclipse.bpmn2.content-type.xml");
resourceSet.setURIConverter(new ProxyURIConverterImplExtension());
modelHandler = ModelHandlerLocator.createModelHandler(modelUri, bpmnResource);
ModelHandlerLocator.put(diagramUri, modelHandler);
try {