code: def is_response(cls, response):
          '''Return whether the document is likely to be a Sitemap.'''
          if response.body:
              if cls.is_file(response.body):
                  return Truf is_response(cls, response):
          '''Return whether the document is likely to be a Sitemap.'''
          if response.body:
              if cls.is_file(response.body):
                  return True
docs: Return whether the document is likely to be a Sitemap.