final StaticQueryContext sqc = config.newStaticQueryContext();
final XQueryExpression exp = sqc.compileQuery("<doc><chap><a>3</a></chap></doc>//a, <b>4</b>, 19");
Properties props = new Properties();
props.setProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
final DynamicQueryContext dynamicContext = new DynamicQueryContext(config);
final SequenceIterator iter = exp.iterator(dynamicContext);
QueryResult.serializeSequence(iter, config, System.out, props);
}