[Zope3-dev] Singleton content objects

[Nicholas Wieland]

Hi *,
  I want a content object to be a singleton.
  To clarify a bit more - the singleton would be a Shopping Cart.
  Do I have to write it like a local utility ? What is the "Right Way"
  to do a thing like that ?
  Pointers to documentation or source code are ok.

TIA,
  ngw