[Zope] applicable standards in zope

Hi, I'm making an study about different Python Web Framework and I need to know if there are any applicable standards in zope. If yes, which ones? Thanks a lot. Natalia. PD: I found this in http://mail.python.org/pipermail/xml-sig/1999-October/001537.html "Anyway, as for Zope (since I'm one of the product manager)" ... "I personally don't believe there are applicable standards for anything we're doing, and we follow where we can."