[Zope-dev] ZCatalog with ZClass

Hello, everyone, It seems that many of you have used ZCatalog pretty well. My problem is that I'd like a ZClass (of a Product) to subclass CatalogAware, and implement all the index and search inside the Product. That means I don't want to do any DTML method stuff outside of the Product. Could anyone tell me how to do it? I can't find anything like API document. I don't have to read through the "Catalog.py" stuff, do I? Thanks in advance. Cheers... Lily