code: def get_content_properties(self, content_id, expand=None, start=None, limit=None, callback=None):
          
          params = {}
          if expand:
              params["expand"] = expand
          if start is not None:
              params["start"] = int(start)
          if limit is not None:
              params["limit"] = int(limit)
          return self._service_get_request("rest/api/content/{id}/property".format(id=content_id),
                                           params=params, callback=callback)
docs: Returns a paginated list of content properties.
  
          Content properties are a key / value store of properties attached to a piece of Content.
          The key is a string, and the value is a JSON-serializable object.
          :param content_id (string): A string containing the id of the property content container.
          :param expand (string): OPTIONAL: A comma separated list of properties to expand on the content properties.
                                  Default: Empty.
          :param start (int): OPTIONAL: The start point of the collection to return. Default: None (0).
          :param limit (int): OPTIONAL: The limit of the number of items to return, this may be restricted by fixed
                              system limits. Default: 10.
          :param callback: OPTIONAL: The callback to execute on the resulting data, before the method returns.
                           Default: None (no callback, raw data returned).
          :return: The JSON data returned from the content/{id}/property endpoint, or the results of the
                   callback. Will raise requests.HTTPError on bad input, potentially.