class <name>(<container_class>):
<doc>
_ctype = <ctype>
### if ### <use_slots>
__slots__ = ("_parent",
"_storage_key",
"_active",
"_data",
"__weakref__")
### fi ###
def __init__(self, *args, **kwds):
self._parent = None
self._storage_key = None
self._active = True
super(<name>, self).__init__(*args, **kwds)