For those curious about this, @type and @subtype on <ref> was only added to the TEI in the July release.
Andrew had a schema generated in June or so, but reading the documentation from July.

All's well that ends well.
--
Sebastian Rahtz      
(acting) Information and Support Group Manager
Oxford University Computing Services
13 Banbury Road, Oxford OX2 6NN. Phone +44 1865 283431

Sólo le pido a Dios
que el futuro no me sea indiferente