The situation with validation of the various documents over the years has become complicated, so I've refactored it, so that documents from volumes 19 and below are validated only against the RNG schema (and all are valid), while those from 20 and above are validated against both the Schematron and the RNG schema. This involved quite a few fixes to many documents, but they were mainly minor (straight apostrophes to curly, rewriting biblStructs as bibls) with no impact on output. Other changes that do affect output included non-substantive (fixes to page-ranges to conform with Chicago; removing spaces around em dashes; etc.) and substantive (changing US to Canadian spelling). For substantive changes, I've added the appropriate revision elements, so the site will document them. I've also entered corrections to three articles and rebuilt the site, as well as working through the TODO folder so I know where to go from here.
Master volume documents are also now valid, so validating the whole collection is straightforward.