I have also struggled gently with this and - at present - tend not to use
IDREF at all. The only - but valuable - benefit of IDREF is that it
requires the parser to check presence of IDs. However I believe that the
XLink approach is not to use IDREF for href so that IDREF cannot be used
with XLink. Since XLink is a cornerstone of much of what I do, I can't see
that I should use IDREF. Is this reasonable?
P.
Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic
net connection
VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary
http://www.venus.co.uk/vhg