[Zope] parsing dynamic XML

HI Is there a way to parse a dynamic XML document in Zope. I'm calling a web service from zope. This web service returns XML. I want to parse this XML and put certain values in session. How can I parse XML I'm getting without physically saving it in Zope. By the way, can I dynamically save this XML in zope. I have XMLDocument and ParsedXML product but can't figure out a way to use these to solve my problem Sushil