code: def read(self):
          
          if not self.__content__:
              self.__retriever__ = self.__resolver__.resolve(self.uri)
              self.__content__, self.__mimetype__ = self.__retriever__.read(self.uri)
          return self.__content__
docs: Read the contents of the Annotation Resource
  
          :return: the contents of the resource
          :rtype: str or bytes or flask.response