[Zope] ListIndex?

I'm putting together some things that inherit from ZCatalog, but that would benefit greatly form being able to catalog list contents. Is there any documentation of the internals of the UnIndex and UnTextIndex modules that'd help me hack together an UnListIndex module? -- Benno Rice "No, no. We're *sweet* and XNFP Aries Dark Subculture- *innocent* evil bastards." friendly Internet Geek benno@netizen.com.au "Defend your joy"