code: def render(self, data, accepted_media_type=None, renderer_context=None):
          
          if data is None:
              return ''
  
          stream = StringIO()
  
          xml = SimplerXMLGenerator(stream, self.charset)
          xml.startDocument()
          xml.startElement(self.root_tag_name, {})
  
          self._to_xml(xml, data)
  
          xml.endElement(self.root_tag_name)
          xml.endDocument()
          return stream.getvalue()
docs: Renders `data` into serialized XML.