Lengthy discussion of the relative merits of METS as an encoding format vs TEI. CP has suggested that METS might be better, from the point of view of OAI compliance, metadata harvesting, and interoperability. However, a quick web survey failed to turn up a single instance of a repository which claims to be able to consume METS, and the two or three repositories PAB identified as being potential users of the images don't have very clear explanations of what they need. PAB will check into what DSpace does. In the meantime, I suggested that she choose the markup schema on the basis of how well it can represent the data she needs to represent; if one can do more than the other, then choose the one that's better, and then transform later into the less satisfactory schema when required for a particular purpose.