Evaluate XPATH

<do-set-local-variable name="varValue" scope="policy">
	<arg-node-set>
		<token-xpath expression="es:getXPATH( $varDoc, $varXPATH )"/>
	</arg-node-set>
</do-set-local-variable>

function getXPATH ( varDoc, varExpression )
    {
    	var varLevel = 3;
    	
        tracer.trace(" getXPATH ( doc ) =====>> " + varDoc, varLevel);
        tracer.trace(" getXPATH ( expression ) =====>> " + varExpression, varLevel);

        var nodeSet = new Packages.com.novell.xml.xpath.NodeSet();
        var document = Packages.com.novell.xml.dom.DocumentFactory.newDocument();
        var ndsElement   = document.createElement("nds");
        document.appendChild(ndsElement);
        ndsElement.setAttributeNS(null, "dtdversion", "3.5");   
        var outputElement = document.createElement("output");
        ndsElement.appendChild(outputElement);
        var instanceElement = document.createElement("instance");

        try
        {
            var docFactory = DocumentBuilderFactory.newInstance();
            var docBuilder = docFactory.newDocumentBuilder();
            var xPathFactory = XPathFactory.newInstance().newXPath();

            var thisDoc = docBuilder.parse( new org.xml.sax.InputSource( new StringReader( varDoc ) ) );
            var thisDocRoot = thisDoc.getDocumentElement();

            var thisExpression = xPathFactory.compile( varExpression );
            var thisValue = xPathFactory.compile( "." );
            var thisResult = thisExpression.evaluate( thisDocRoot, XPathConstants.NODESET );

            var varResult_Length = thisResult.getLength();
            var attrElement = document.createElement("attr");

            for ( len = 0; len < varResult_Length; len++ )
                {
                    singleNode = thisResult.item( len ).cloneNode(true);
                    var myValue = thisValue.evaluate(singleNode, XPathConstants.STRING);
			        tracer.trace(" getXPATH ( value " + Number(len + 1) + " ) =====>> " + myValue, varLevel);
                    var valueElement = document.createElement("value");
                    valueElement.appendChild(document.createTextNode(myValue));
                    attrElement.appendChild(valueElement);
                }

        }
        catch (err)
        {
            var attrElement = document.createElement("attr");
            var myValue = thisExpression.evaluate( thisDocRoot, XPathConstants.STRING );
	        tracer.trace(" getXPATH ( value 1 ) =====>> " + myValue, varLevel);
            var valueElement = document.createElement("value");
            valueElement.appendChild(document.createTextNode(myValue));
            attrElement.appendChild(valueElement);
        }
        finally
        {
            instanceElement.appendChild(attrElement);
            outputElement.appendChild(instanceElement);
            nodeSet.add(instanceElement);
            return nodeSet;
        }
    }