code: def append(self, parent, content):
          
          log.debug('appending parent:\n%s\ncontent:\n%s', parent, content)
          if self.start(content):
              self.appender.append(parent, content)
              self.end(parent, content)
docs: Append the specified L{content} to the I{parent}.
          @param parent: The parent node to append to.
          @type parent: L{Element}
          @param content: The content to append.
          @type content: L{Object}