The "original" map is now functional. I've also changed the way I'm handling pages and folders so that it's much simpler all round, and there's only one XSLT file. This is how it works, basically:

• All pages are now served from the root, with [xml:id].htm file names.
• All pages apart from the map pages are handled by index.xql.
• All pages apart from the map pages (which produce XHMTML directly) are passed through general.xsl.
• All links are simplified because all pages are served from the same directory.
• Bibliographic sources are working well.

Next steps:

• Literary references are supposed to work the same way as bibliographic references.
• BIBL1.xml should be in a subdirectory.
• The selected menu item should be highlighted when you're on one of the root pages.
• Remaining PHP pages need to be converted.
• List-of-ids page needs to be created (as a sortable table with lots of info).
• Site layout needs to be redesigned to be expandable and to use actual text.