Used my ODD file to generate a new schema from Roma, and compared it with the previous version. Apart from the date/@value attribute changing to @when, which I expected, another change has rendered <hi> tags inside <rendition> tags invalid in the header, which screws up my Image Markup code. Wrote to the TEI list about this; it seems like a silly change. I can't release another IMT until it's either undone, or if it's permanent, until I've found another way to encode that information and updated the tool to handle it.

However, I did write the four XSLT conversion files to transform older data files to the 1.6 format, and tested the last of them; that's out of the way. If the problem above is not fixed by changes in TEI, then I'll have to add to these files.