* @throws SAXException When a problem with XML data binding occurs.
* @throws IOException When the XML schema file cannot be accessed.
*/
private Schema unmarshalSchema(final String schemaName) throws SAXException, IOException {
Parser parser = null;
InternalContext internalContext = new BackwardCompatibilityContext();
try {
parser = internalContext.getParser();
} catch (RuntimeException rte) {
fail("Can't optain sax parser!");
}
if (parser == null) {