[dom4j-user] problem with xpath expression

[Oliver Schneider]

Hi all together,

I have a question concerning XPath evaluation with Dom4J.

Here the relevant Java code snippet of my program:

   private Document createConfirmationXML(String generatePDF, String 
validatePrev, String createdFlag, String statusMessage) 
   {
       if (xmlConfirmationDoc == null) // first creation of 
confirmation Doc
       {
           xmlConfirmationDoc = 
DocumentFactory.getInstance().createDocument();
           confirmation = 
xmlConfirmationDoc.addElement("confirmation").addAttribute("generate_pdf", 
generatePDF)
                                            .addAttribute("week", 
week).addAttribute("validate_prev", validatePrev)
                                           
.addAttribute("xsi:noNamespaceSchemaLocation", "confirmations.xsd");
           confirmation.add(new org.dom4j.Namespace("xsi", 
"http://www.w3.org/2001/XMLSchema-instance";));
           confPrev = 
confirmation.addElement("prevision").addAttribute("id", 
prevId).addAttribute("created", createdFlag);
           confPrev.addElement("status").addText(statusMessage);
       }
       else // in case confirmation doc already exists
       {
          // it has to be checked if a <prevision> element for the 
given prevId already exists
          Map uris = new HashMap();
          uris.put("xsi", "http://www.w3.org/2001/XMLSchema-instance";);
         
          XPath xpath = 
xmlConfirmationDoc.createXPath("/confirmation/[EMAIL PROTECTED]'" + prevId 
+ "']");
          xpath.setNamespaceURIs(uris);
         
          List results = xpath.selectNodes(xmlConfirmationDoc);
         
           if (results.size() == 0) // <prevision> element does not 
already exist for the given prevId
           {
               confPrev = 
confirmation.addElement("prevision").addAttribute("id", 
prevId).addAttribute("created", createdFlag);
               confPrev.addElement("status").addText(statusMessage);
           }
           else // <prevision> element already exists for the given prevId
           {
               for (Iterator iterator = results.iterator(); 
iterator.hasNext();)
               {
                   Element confPrevision = (Element)iterator.next();
                   
confPrevision.addElement("status").addText(statusMessage);
               }
           }
       }
       return xmlConfirmationDoc;
   }

And this is an example for a confirmation.xml that has to be generated 
and parsed:

<?xml version="1.0" encoding="UTF-8"?>
<confirmation generated_pdf="true" week="2003-02-01" 
validated_prev="true" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:noNamespaceSchemaLocation="confirmations.xsd">
   <prevision id="L_2003123" created="true">
         <status>prevision created successfully</status>
   </prevision>
</confirmation>

For me my Java code looks correct. However, if I run the program, I 
always get an error stating that the XPath expression in the following 
line is invalid:
     XPath xpath = 
xmlConfirmationDoc.createXPath("/confirmation/[EMAIL PROTECTED]'" + prevId 
+ "']");

The weird thing is that if I test the same XPath expression with XML-Spy 
I get the requested <prevision> node.
I am currently using DOM4J 1.6.1. with Java 4 (can't use Java 6 at work).

I would be very happy, if someone can help me fix that issue.

Best regards,
Oliver Schneider
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