Xerces?

Hi all, I have done limited looking but as far as I can tell Xerces is not supported by PHP. A) hopefully I am wrong and just didn't look hard enough. B) If not, any validating parsers that are supported that do DTD validation? It looks like there's an experimental Xalan ext out there, but no Xerces. I have a vague memory of the XML setup being generalized to allow (x) parsers, did that happen, etc? In any case, if there aren't any validating parsers supported by PHP... There should be :) Please respond to the binarycloud-dev list also... Thanks, _alex