[Zope] ZTopics and Canned Queries

Hello all, I have been trying to use ZTopics to create views for my issue tracker product and have come across a limitation. In a ZTopic object, the query is entirely hardcoded, whereas what I need is a 'parameterized' query where the value of a filter may be supplied through the REQUEST at call time. For example, I can create a ZTopic called FilterCreator: (creator : 'shalabh') Now http://url/FilterCreator will return all cataloged objects with creator=='shalabh'. What I want to do is create: (creator : creatorName) And use http://url/FilterCreator?creatorName=shalabh Currently ZTopic does not allow me to create an object like above as it tries to evaluate the query at creation time.