[Zope] Changing Properties With ZPT

I'm trying to figure out how I can change the properties of a template with ZPT. For example, let's say I've got a Page Template with a property called 'name' and I want to change it in response to something in the HTTP request: <div tal:condition="python:'name' in context.REQUEST"> SOME CODE TO CHANGE THE PROPERTY TO EQUAL context.REQUEST['name'] </div> I haven't seen anyway to do this with ZPT so I'm assuming that I'll need to use a python script of some sort, but I'm not sure how to access the template's properties without hardcoding the template's name. Anybody got any suggestions?