code: def process(self, content):
          
          log.debug('processing:\n%s', content)
          self.reset()
          if content.tag is None:
              content.tag = content.value.__class__.__name__
          document = Document()
          self.append(document, content)
          return document.root()
docs: Process (marshal) the tag with the specified value using the
          optional type information.
          @param content: The content to process.
          @type content: L{Object}