Making a TEI-encoded version of Bédier's 1913 edition of Jean Renart's Lai de l'ombre. Gallica.bnf.fr provides a scan and OCR. Hand work in emacs yields a valid TEI document. Half an hour for an ixml grammar for the foot-of-the-page apparatus, several more hours to tweak it for slips and OCR flaws. And voila, a fully parsed negative apparatus.
Next: align with base text and re-encode in parallel segmentation form.
Hurrah for Gallica, and Emacs, and XQuery, and Invisible XML.