error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);
XObject arg = m_arg0.execute(xctxt);
int argType = arg.getType();
XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
NodeSetDTM nodeSet = nodes.mutableNodeset();
if (XObject.CLASS_NODESET == argType)
{
DTMIterator ni = arg.iter();
StringVector usedrefs = null;