code: def append(self, content):
          
          self.start(content)
          self.append_attributes(content)
          self.append_children(content)
          self.append_text(content)
          self.end(content)
          return self.postprocess(content)
docs: Process the specified node and convert the XML document into
          a I{suds} L{object}.
          @param content: The current content being unmarshalled.
          @type content: L{Content}
          @return: A I{append-result} tuple as: (L{Object}, I{value})
          @rtype: I{append-result}
          @note: This is not the proper entry point.
          @see: L{process()}