There were several instances in which document content such as figure and head elements was directly inside the front or body, without any intervening div. This was causing rendering issues -- head element styles were being lost, for example. I fixed all instances of this, and added a Schematron rule to prevent it in future.

We've also devised a bit of an encoding hack, involving nested date elements, to get around the TEI's decision not to allow @when alongside other attributes on dates. CC will implement it by examining all cases, and then I'll deal with any processing fallout as required.