-class SimpleXMLObject : public AbstractDOMCachingXMLObject, public AbstractXMLObjectMarshaller, public AbstractXMLObjectUnmarshaller
+class SimpleXMLObject
+ : public AbstractAttributeExtensibleXMLObject,
+ public AbstractComplexElement,
+ public AbstractDOMCachingXMLObject,
+ public AbstractXMLObjectMarshaller,
+ public AbstractXMLObjectUnmarshaller