UnmarshalHandler unmarshalHandler = unmarshaller.createHandler();
SourceUtil.toSAX(this.manager, this.grammarSource, null,
Unmarshaller.getContentHandler(unmarshalHandler));
ExtendedGrammar grammar = (ExtendedGrammar)unmarshalHandler.getObject();
if (grammar==null)
throw new ProcessingException("Error while reading the grammar from "+src);
setExtendedGrammar(grammar);