I'm currently preparing a large collection of scanned documents for Wikisource.

Do we have any guidance on internal metadata inside djvu files? It appears that I can just cram in arbitrary XML into the DJVU files, but I can't find any good schema for this on the Internet. If no one has suggestions, I'll just make it up as I go.

Of course, the same metadata will also be provided on the media pages, but I believe that the internal metadata will be useful to others who obtain our files.