URI uri1 = URI.createFileURI("model/ReferenceModel1.uml");
URI uri2 = URI.createFileURI("model/ReferenceModel2.uml");

UMLResourcesUtil.initResourceFactoryRegistry(Resource.Factory.Registry.INSTANCE);
        
ResourceSet resourceSet1 = new ResourceSetImpl();
ResourceSet resourceSet2 = new ResourceSetImpl();

resourceSet1.getResource(uri1, true);
resourceSet2.getResource(uri2, true);

IComparisonScope scope = new DefaultComparisonScope(resourceSet1, resourceSet2, null);
Comparison comparison = EMFCompare.builder().build().compare(scope);

List<Diff> differences = comparison.getDifferences();
for (Diff diff : differences) {
    System.out.println(diff);
}

Builder builder = EMFCompare.builder();
final IPostProcessor.Descriptor.Registry<String> postProcessorRegistry =
    new PostProcessorDescriptorRegistryImpl<String>();
BasicPostProcessorDescriptorImpl post = new BasicPostProcessorDescriptorImpl(
    new UMLPostProcessor(),
    Pattern.compile("http://www.eclipse.org/uml2/\\d\\.\\d\\.\\d/UML"),
    null);
postProcessorRegistry.put(UMLPostProcessor.class.getName(), post);
builder.setPostProcessorRegistry(postProcessorRegistry);
Comparison comparison = builder.build().compare(scope);