Please help in XPath to parse XML with namespace

[Abhijit Das]

hi,
I can not parse XML document having namespace in the root element.Is there any condition to parse a XML file with namespace by using XPath APIs?I have a .xml file with the following root element with namespace ( it is .xpdl file generated from BPMN).
e.g.

     
    <?xml version="1.0" encoding="UTF-8"?> 
    <catalog xmlns:journal="http://www.w3.org/2001/XMLSchema-Instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Name="Diagram 1" OnlyOneProcess="false" xmlns="http://www.wfmc.org/2004/XPDL2.0alpha"> 
    <PackageHeader>
       ....
    </PackageHeader>
      ......
      ......
    </catalog>

The Above file is not parsing. My coding is

       
     XPath xpath = XPathFactory.newInstance().newXPath();
                String expression = "/Package/PackageHeader";
                InputSource inputSource=new InputSource(new FileInputStream(xmlDocument));
                NodeList nodeList =  (NodeList)xpath.evaluate(expression, inputSource, XPathConstants.NODESET);
                System.out.println("Length :: " + nodeList.getLength());
                for(int i=0 ;i<nodeList.getLength(); i++){
                    Node node = nodeList.item(i);
                    System.out.println(":::::::::: "+i+ node);
                }
            } catch(Exception e) {
                System.out.println("Error  ::" + e.getMessage());
                e.printStackTrace();
            }
     
    o/p : Length :: 0
 

But, once I change the attribute of <Package> element with only one type of attribute "xmlns".
It works fine.
Thanks in advance