> I don't think the same situation applies to SAX. SAX is still fairly young and
> we have a better chance to dictate/agree on required features, so we should
> avoid optional features as long as possible.
Within XML 1.0, there are various things that non-validating parsers
are allowed to do (or not do). A way of querying any particular parser
to find out whether it does those things or not would be very useful.
For example, a parser is allowed to disregard attribute types and
claim that all attributes are CDATA. If your application depends on
getting ID and IDREF types correct, you could query a parser to see
if it can do that --- and if not, tell the user to pick another parser.
So these are not so much SAX features as XML features.
-- John Cowan http://www.ccil.org/~cowan cowan@ccil.org You tollerday donsk? N. You tolkatiff scowegian? Nn. You spigotty anglease? Nnn. You phonio saxo? Nnnn. Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5)