[Zope] What are the different base classes of a Zclass ?

Hi everybody, Can somebody tell me what are the different base classes that we can select when creating a Zclass ? Or is there a document somewhere ? I know that we can add some base classes to the availlable option list. So where do they come from ? Bye... Benoit Dominiak +33 (0)608463826 www.koubiac.fr.st _________________________________________________________________ Téléchargez MSN Explorer gratuitement à l'adresse http://explorer.msn.fr/intl.asp