[Zope] Best way to have special objects in my products produc list?

[Lennart Regebro]

From: "Dieter Maurer" <dieter@handshake.de>
> I use an appropriate "all_meta_types" method in my "container" products.
>
> Why? I did not yet meet a simpler way...

As I understand it all you can do there is to filter out meta_types. I need
also to include a meta_type.
If I just add in a meta_type that product isn't registered, and so has no
icons and so on, so I need some type of registration too, right?