docs: def get_attribute_map(self, mapped_class=None, key=None):
          """
          Returns an ordered map of the mapped attributes for the given mapped
          class and attribute key.
  
          :param key: Tuple of attribute names specifying a path to a nested
            attribute in a resource tree. If this is not given, all attributes
            in this mapping will be returned.
          """
          if mapped_class is None:
              mapped_class = self.__mapped_cls
          if key is None:
              key = MappedAttributeKey(())
          return OrderedDict([(attr.resource_attr, attr)
                              for attr in self._attribute_iterator(mapped_class,
                                                                   key)])