code: def MultiReadClientLabels(self, client_ids):
      
      res = {}
      for client_id in client_ids:
        res[client_id] = []
        owner_dict = self.labels.get(client_id, {})
        for owner, labels in iteritems(owner_dict):
          for l in labels:
            res[client_id].append(rdf_objects.ClientLabel(owner=owner, name=l))
        res[client_id].sort(key=lambda label: (label.owner, label.name))
      return res
docs: Reads the user labels for a list of clients.