var cache = new ActiveXObject("MSXML2.XMLSchemaCache.6.0");
var schema = new ActiveXObject("MSXML2.DOMDocument.6.0");
schema.validateOnParse = true;
schema.async = false;
schema.setProperty("ResolveExternals", true);
if (schema.load("A.xsd")) {
  try {
    schema.setProperty("SelectionLanguage", "XPath");
    schema.setProperty("SelectionNamespaces", "xmlns:xsd='http://www.w3.org/2001/XMLSchema'");
    var attr = schema.selectSingleNode('/xsd:schema/@targetNamespace');
    cache.add(attr.nodeValue, schema);
  } catch (e) {
    WScript.echo(e.description);
  }
} else {
  WScript.echo('Load error');  // for details see schema.parseError
}