[Problem with namespace]

[Marco Büchler <ma...@studserv.uni-leipzig.de>]

hi,

i've some problems using xml with the default namespace. i use Xalan 
2.6.0. this is the problem:


i have an xml-file similar to this:
<?xml version="1.0" encoding="UTF-8"?>
<elem xmlns="uni-leipzig.de" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" Version="2001-1" 
xsi:schemaLocation="uni-leipzig.de ANY_URL">
       <child name="test"/>
       <child name="test2"/>
  </elem> 
   
now i want to use some xpath expressions like this /elem/child/@name

for this i use an example similar to the ApplyXPathDOM example 
delievered by xalan.
objEvaluator = new XPathEvaluatorImpl( objMessage );
objResolver =  objEvaluator.createNSResolver( objMessage );
objResult = (XPathResult)objEvaluator.evaluate(strXPath, objMessage, 
objResolver, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);


all this works fine for xml files like this:
<?xml version="1.0" encoding="UTF-8"?>
<elem xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
Version="2001-1" xsi:schemaLocation="uni-leipzig.de ANY_URL">
       <child name="test"/>
       <child name="test2"/>
  </elem>
(files where the default namespace is not set). is this namespace set i 
get an nullpointer exeception.

does have anyone an idea??

thankz

ciao
marco

Re: [Problem with namespace]

[George Cristian Bina <ge...@sync.ro>]

 > The alternative -- which is VERY bad practice -- is to match on node type
 > with predicates to test the node's local name, thus bypassing namespace
 > sensitivity.

You can also check the namespace, something like
//*[local-name()='test' and namespace-uri()='http://test.com']
will match all test elements from the http://test.com namespace.

Best Regards,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com


Joseph Kesselman wrote:
> 
> 
> 
> XPaths are namespace-aware. If you want to reference a node that's in a
> namespace, the XPath must use a prefix bound to that namespace. (XPath 2.0
> is introducing the ability to set a default namespace for an XPath, I
> believe, but Xalan doesn't support that yet.)
> 
> The alternative -- which is VERY bad practice -- is to match on node type
> with predicates to test the node's local name, thus bypassing namespace
> sensitivity.
> 
> ______________________________________
> Joe Kesselman, IBM Next-Generation Web Technologies: XML, XSL and more.
> "The world changed profoundly and unpredictably the day Tim Berners Lee
> got bitten by a radioactive spider." -- Rafe Culpin, in r.m.filk

Re: [Problem with namespace]

[Joseph Kesselman <ke...@us.ibm.com>]

XPaths are namespace-aware. If you want to reference a node that's in a
namespace, the XPath must use a prefix bound to that namespace. (XPath 2.0
is introducing the ability to set a default namespace for an XPath, I
believe, but Xalan doesn't support that yet.)

The alternative -- which is VERY bad practice -- is to match on node type
with predicates to test the node's local name, thus bypassing namespace
sensitivity.

______________________________________
Joe Kesselman, IBM Next-Generation Web Technologies: XML, XSL and more.
"The world changed profoundly and unpredictably the day Tim Berners Lee
got bitten by a radioactive spider." -- Rafe Culpin, in r.m.filk