[Zope] ZCatalog question

Hi all, This may be a dumb question but I have perused the docs and can't seem to find an answer. I am trying to catalog an attribute that doesn't seem to be either a field index or a text index. Lets say my example attribute is a list of subjects, and when I search for a document, I want to get documents of a certain subject. So I have a document that I want to appear under "Help" and "Monkeys" and in themselves I want to treat the subjects atomically (Field Index) , but I want more than one for each document (more TextIndexish, but not quite). So I was wondering can I do this with ZCatalog or sohuld I do it with other python logic. thanks -scott