return null;
if (fSchemaHandler == null) {
fXSGrammarBucket = new XSGrammarBucket();
fSubGroupHandler = new SubstitutionGroupHandler(fXSGrammarBucket);
fSchemaHandler = new XSDHandler(fXSGrammarBucket);
fCMBuilder = new CMBuilder(new XSDeclarationPool());
}
// we already have an error reporter, entityManager, entity resolver, etc.
String externalSchemas =