James Clark wrote:
> > On the other
> > hand IDREFs are an XML 1.0 DTD feature that is purely to do with
> > validation.
>
> Also note that there are important DTDs that use IDREFS. Notably XHTML
> uses it in the basic tables modules and DocBook also uses it.
>
> I think it would a significantly loss from a marketing perspective not to
> able fully to validate XHTML or DocBook.
DTDs have ID, IDREF, and IDREFS, but it does not have IDS. At present,
<list><key>...</key></list> is allowed. Are there any reasons?
Cheers,
Makoto
