I'm not sure exactly which texts are included, but the 'Tripitaka
Koreana' is a supposedly well-regarded 80,000-woodblock edition
of various texts that either has been (or is being) digitised,
cross-referenced with other editions and placed online at
http://www.sutra.re.kr

It may be a good resource to link to, or a useful group to
get in touch with as I believe they have already created or
used some XML standards during their digitisation.

- Walter