XML Validation (DTD, Schema/XSD) in actionscript 3?

I understand that AS3 now has the “XML” class which is a “validating parser”. This means that the XML has to be well-formed. However, I am wondering if this also means that the AS3 XML class will validate the XML against an inline declared DTD or XSD Schema, or if it only checks for well-formed’ness?

If it doesn’t actually validate an XML against the DTD, does anyone know how one would go about doing that with AS code? Is there any free classes that do this already?

AS3 just checks against well-formed syntax. It won’t pay any regard to the DTD or XSD.