Validating xml scema
Requiring users to install Xerces is simply too onerous a requirement; few will have it already and the Xerces installation system leaves much to be desired.
Those are feature requests, and believe me, I know we've got a long way to go.
Also, minimum and maximum constraints as described in the spec are not checked.
float Notes: The restrictions on double support apply to float as well.
If you don't see an element or an attribute here then you definitely can't use it in a schema document.
You can expect that the schema document parser will produce an error if you include elements which are not supported.