On Jan 22, 2004, at 3:09 PM, Andrew E Switala wrote:

> What would be perfect would be to have authority/type attributes that
> actually meant something to a schema processor. Or something similar.

Yes; true.

While I've not tried it, I'm pretty sure RELAX NG would allow
attribute-value specific data-typing (I know it allows other
attribute-level validation).  Perhaps at some point we'll see the same
in XML Schema...