Wrote the XSLT to convert appendices, and began work on the reference list (bibliography) code. I've got the list framework working. I'm now looking at the rather odd NLM structures used for reference items. They don't seem to have any way of distinguishing authors from editors, other than by wrapping them in <person-group> tags with a person-group-type attribute; I guess that reflects the reality in scientific fields, were no-one publishes anything alone. The whole thing seems less structured than a TEI equivalent, being more of a loose agglomeration of tags.