// create model factories
ModelFactoryExtensionPoint modelFactories =
registry.getExtensionPoint(ModelFactoryExtensionPoint.class);
modelFactories.addFactory(new ImplementationXYZFactoryImpl());
modelFactories.addFactory(new DefaultImportExportXYZFactory());
// Create URL artifact processors
URLArtifactProcessorExtensionPoint urlProcessors =
registry.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);