xalan-j extension passing the value of a xsl:variable to the extension class

[Sticker, Markus / Kuehne + Nagel / Ham MI-EC /external]

Hello,

I have a problem with my extension, because I didn't get it working to pass a 
value of a xsl:variable to my extension.

-------8<-------- XSLT-CODE ----------------------
                ...
                <xsl:variable name="def">
                   <bo>
                        <item>1</item>
                        <line>4</line>
                        <totals>6</totals>
                </bo>
                </xsl:variable>
                <my:lineWeight select="exslt:node-set($def)/bo/totals" />
                
                ....
                
                

-------8<-------- Java-CODE ----------------------

        public void line(org.apache.xalan.extensions.XSLProcessorContext 
context,
                        org.w3c.dom.Element elem) {
                
                  String value = elem.getAttribute("select");
                                    int val;
                    try 
                    {
                      val = Integer.parseInt (value);
                    } catch (NumberFormatException e) 
                    {
                        e.printStackTrace ();
                        val = 0;
                      }
                    
                lineCount += val;
        }


-------8<-------- Error ----------------------

java.lang.NumberFormatException: For input string: 
"exslt:node-set($def)/bo/totals"
        at java.lang.NumberFormatException.forInputString(Unknown Source)
        at java.lang.Integer.parseInt(Unknown Source)
        at java.lang.Integer.parseInt(Unknown Source)
        at kn.iopm.xalan.ext.textFiller.line(textFiller.java:51)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at 
org.apache.xalan.extensions.ExtensionHandlerJavaClass.processElement(ExtensionHandlerJavaClass.java:517)
        at 
org.apache.xalan.templates.ElemExtensionCall.execute(ElemExtensionCall.java:234)
        at 
org.apache.xalan.templates.ElemForEach.transformSelectedNodes(ElemForEach.java:425)
        at org.apache.xalan.templates.ElemForEach.execute(ElemForEach.java:265)
        at 
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2400)
        at 
org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:394)
        at 
org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.java:248)
        at 
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2400)
        at 
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2270)
        at 
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1356)
        at 
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:709)
        at 
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1273)
        at 
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1251)
        at kn.iopm.xalan.ext.run_test.main(run_test.java:28)



Does somebody know what I'm doing wrong? It seams that the SELECT-Attribute 
wasn't executed.
thanks for your help

best regards

Markus

Kuehne + Nagel (AG & Co.) KG, Geschaeftsleitung: Hans-Georg Brinkmann (Vors.), 
Dirk Blesius, Reiner Heiken, Bruno Mang, Alfred Manke, Christian Marnetté, Mark 
Reinhardt, Jens Wollesen, Klaus Jaeger (stellv.), Sitz: Bremen, 
Registergericht: Bremen, HRA 21928, USt-IdNr.: DE 812773878, Persoenlich 
haftende Gesellschaft: Kuehne & Nagel A.G., Sitz: Contern/Luxemburg 
Geschaeftsfuehrender Verwaltungsrat: Klaus-Michael Kuehne