[Zope-CMF] Classes whose instances appear in ZODB

[George Lee]

If I want a class to appear in the ZODB, is that just a matter of
subclassing SimpleItem?

What additional attributes do I need to set -- for instance, do I need
to define 'meta_type' for the class?

Can a class be persistent but not have its instances appear in the
ZODB -- for instance, does subclassing Persistent do this? (I want to
define two classes, one of which stores instances of the other as an
attribute.)

Thanks; peace,
George