One of the major tasks in this post is to figure out how to link <cit>, <q>, <quote> and <bibl> tags to the xml:id attributes of <biblStruct> elements containing details of the cited work. The key attribute is not available on these tags, so we're left with three options:

1. ana: indicates one or more elements containing interpretations of the element on which the ana attribute appears.
2. corresp points to elements that correspond to the current element in some way.
3. n gives a number (or other label) for an element, which is not necessarily unique within the document.

The first smacks of tag-abuse, because it's really meant to point to an analytical interpretation. The third is a multi-purpose attribute which is available almost everywhere. corresp seems most appropriate, especially for <bibl> tags (it's less suitable for the other tags, but it would do at a pinch).

Adding this as a task, because I need to search the TEI-L archives for any discussion of this before, then lay out my proposed solution (corresp and get comments.