docs: def uri_to_graph(uri, **kwargs):
      '''
      :param string uri: :term:`URI` where the RDF data can be found.
      :rtype: rdflib.Graph or `False` if the URI does not exist
      :raises skosprovider.exceptions.ProviderUnavailableException: if the
          getty.edu services are down
      '''
      s = kwargs.get('session', requests.Session())
      graph = rdflib.Graph()
      try:
          res = s.get(uri)
      except requests.ConnectionError as e:
          raise ProviderUnavailableException("URI not available: %s" % uri)
      if res.status_code == 404:
          return False
      graph.parse(data=res.content)
      return graph