def is_referenced(self, uri):
try:<EOL><INDENT>url = '<STR_LIT>'.format(self.registry_url)<EOL>r = requests.get(url, params={'<STR_LIT>': uri})<EOL>return RegistryResponse.load_from_json(r.json())<EOL><DEDENT>except Exception as e:<EOL><INDENT>log.error(e)<EOL>return RegistryResponse(uri, False, None, None, None)<EOL><DEDENT>
This method checks if a certain uri is being referenced from resources
in other applications.

:param string uri: URI of the resource that needs to be checked
:rtype: :class:`pyramid_urireferencer.models.RegistryResponse`