[VW 7.7+] Parse XSD file fails because of ID attribute

I've searched this forum and found some topics concerning this subject (XML validation with XSD), but unfortunately, these topics were already a bit outdated.

I'm trying to validate a XML file with a XSD using the SchemaHandler class from the XSchema package.  Firstly, I create a SchemaHandler object to parse my schema-file:

The parsing fails because the XSD file contains a ID-attribute in the root-element.  The error I get is: 'Schema: Attribute id not recognized'
When I remove this ID-attribute, the validation succeeds.

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="someIdentification" xmlns:xs="http://www.w3.org/2001/XMLSchema">

Is this a known issue in VisualWorks or is there any workaround for this (apart from removing this attribute) ?
Maybe do there exist other, better packages for XML processing?

Thanks.