code: def get_default_mimetype(self):
  		
  		mimetype = self.default_mimetype
  		if mimetype is None:	# class inherits from module default
  			mimetype = DEFAULT_MIMETYPE
  		if mimetype is None:	# module is set to None?
  			mimetype = 'application/rdf+xml'
  		return mimetype
docs: Returns the default mimetype