<elementwithidref-4 xmlns = "http://www.w3.org/XQueryTest/ididrefs" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance">id4</elementwithidref-4><elementwithidref-6 xmlns = "http://www.w3.org/XQueryTest/ididrefs" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance">id4</elementwithidref-6> 