traversal.visitOperation(true);
traversal.visitBinding(true);
traversal.visitMessage(true);
traversal.visitPort(true);
traversal.visitPortType(true);
traversal.visitExtensibilityElement(true);
traversal.ignoreImport();
traversal.ignoreDefinition2Binding();
traversal.ignoreDefinition2Element();
traversal.ignoreDefinition2ExtensibilityElement();