XObject xuse = kd.getUse().execute(ki.getXPathContext(), testNode,
ki.getPrefixResolver());
if (xuse.getType() != xuse.CLASS_NODESET)
{
XMLString exprResult = xuse.xstr();
((KeyIterator)m_lpi).addRefNode(exprResult, testNode);
if (lookupKey.equals(exprResult))
return DTMIterator.FILTER_ACCEPT;
}