Nathan Vack wrote: > Unless I'm totally, hugely mistaken, MARC doesn't say anything about > holdings data, right? If I want to facet on that, would it make more > sense to add holdings data to the MARC XML data, or keep separate xml > files for holdings that reference the item data? As others have said, you can get *some* holding data in a marcxml file, but nothing that will help you. Especially the holding data could change at a moments notice. You will have to get access to your holdings data some other way on a real-time (or 15 - 30 minute) delay. Andrew