qname.setPrefix(prefix);
	public String getStringValue() throws XPathException {	    if(qname.needsNamespaceDecl()) {			String prefix = context.getPrefixForURI(qname.getNamespaceURI());			if (prefix == null)				throw new XPathException(					"namespace " + qname.getNamespaceURI() + " is not defined");	    }		return qname.toString();	}