LB> Is any of them TEI conformant?
Presuming your modification is properly documented, they are all
conformant. Option (b), however, does not follow TEI recommended
Thus, if I had a really good reason to stick with (b), the current
encoding -- e.g., very expensive software that knows how to process
that, but not the others, the way I want to -- I'd use it. Otherwise
I'd prefer (a) as best, (c) next.
Note, however, that I am applying P4-like definitions to what is
ostensibly a P5 document, which Council hasn't actually decided to do