code: def r_annotation(self, sha):
          
          annotation = self.__queryinterface__.getResource(sha)
          if not annotation:
              return "invalid resource uri", 404
          response = {
              "@context": type(self).JSONLD_CONTEXT,
              "id": url_for(".r_annotation", sha=annotation.sha),
              "body": url_for(".r_annotation_body", sha=annotation.sha),
              "type": "Annotation",
              "target": annotation.target.to_json(),
              "owl:sameAs": [annotation.uri],
              "dc:type": annotation.type_uri,
              "nemo:slug": annotation.slug
          }
          return jsonify(response)
docs: Route to retrieve contents of an annotation resource
  
          :param uri: The uri of the annotation resource
          :type uri: str
          :return: annotation contents
          :rtype: {str: Any}