My hacked-together XSLT for @rendition/<rendition> from a few weeks ago was only handling labels and notes, but we obviously need a better approach, so I've done the initial implementation. As it stands:

• Any <rendition> elements in the header are turned into classes in a local stylesheet.
• Any elements which are already being produced with classes have rendition-based classes added to the class attribute.
• Any elements which are output without classes are processing @* (hopefully), and this triggers a template matching @rendition which creates a class attribute.

I've purposely allowed for the use of the rendition system in born-digital as well as primary source documents, mainly because there are overlapping templates so it's hard to distinguish which context you're in half the time, but I don't want or expect rendition to be used on born-digitals; if it is, then something is probably not right with the encoding.