[jdom-interest] XPath and Namespaces

[Laurent Bihanic]

Hi,

 From the Javadoc of Jaxen's NamespaceContext: "In XPath, there is no such 
thing as a 'default namespace'. The empty prefix *always* resolves to the 
empty namespace URI."

I haven't verified against the XPath spec but this clearly indicates you can't 
use "" as namespace prefix in XPath.
You should fill a bug against Jaxen requesting XPath.addNamespace to throw an 
exception if the passed namespace prefix is empty.

Laurent

Carsten Karkola wrote:
> I tried to use XPath with jdom.Document:
> 
> Document doc = builder.build(filename);
> try {
>   org.jaxen.XPath path = new JDOMXPath(args[1]);
>   path.addNamespace("",doc.getRootElement().getNamespace().getURI());
>   List results = path.selectNodes(doc);
> 
>   Iterator i = results.iterator();
>   while (i.hasNext()) {
>    Element elem = (Element) i.next();
>    System.out.println("Element: " + elem.getName() );
>   }         
>   System.out.println(results.size() + " Elements");
>  } catch (org.jaxen.JaxenException e) {
>      System.err.println(e);
>  }
> 
> If I use a XPath like //*[2] I will get all the second childs of all my elements 
> incl. the <email> element, but if I try to get all child elements by name, there 
> are some problems (e.g. //email) - I get no results
> 
> I think, it's a namespace problem ?
> 
> Thanks for any help.
> Carsten
> 
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