Where is face information stored, and how can it be exported

I don't have the product yet, but after hearing our photographer's rave review of the faces feature, I'm wondering where iPhoto stores the faces information... and how that info can be exported.
does it get tagged in like exif info, or can the program export a per-file xml piece of information, or what?

If you are interested in mucking arond with iPhoto databases, I think you might be able to extract the information.
One way that will work is to create a smart album with the name of the person. This will create an album that is always up to date with that person's photos. You can then parse out the photos from the AlbumData.xml and figure out which photos have which that person in it.
Another way that doesn't involve creating smart albums (if you don't want those to clutter iPhoto) is to look at the face.db file. This file is an sqlite3 database that contains information about all of the "faces" in your database. You can see the contents of the database with the command
/usr/bin/sqlite3 face.db .dump > dump.txt
I haven't figured out what all of the fields are, but I'm sure that there are lines that contain ID numbers for the photos (which you can get from the AlbumData.xml file). I'm sure that someone will publish how to extract what you need from this file at some point (of course this is hacking around in the internal database from iPhoto which can easily change at any time). I haven't reverse engineered the format yet, but might do so at some point (I am also very interested in this information).
Ron

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