Retrieving a specific element in an XML doc, when it belongs to anamespace.

[Axelle Apvrille (LMC)]

I've got another question... regarding namespaces.
If I'm parsing an XML document such as this one:
<?xml version='1.0' encoding='ascii'?>
<dsi:Information xmlns='http://www.w3.org/2001/XMLSchema'
xmlns:dsi='http://www'>
<dsi:Alarm>toto</dsi:Alarm>
</dsi:Information>
How can I retrieve directly the Alarm node ? I mean, I can request 
->getElementsByTagName( ... dsi:Alarm );
but the problem is that to do so, I need to know the prefix that the 
user has chosen in his XML document for the corresponding namespace.
If I do that, and somebody asks me to parse:
<?xml version='1.0' encoding='ascii'?>
<z:Information xmlns='http://www.w3.org/2001/XMLSchema'
xmlns:z='http://www'>
<z:Alarm>toto</z:Alarm>
</z:Information>
Of course, it won't work...

I saw the getPrefix(), getNamespaceURI() and getLocalName()methods of 
DOMNode, but does this mean I should parse through _all_ nodes of my XML 
document, and check for each node whether it's local name is Alarm, and 
check the namespace URI matches the one I'm expecting ?
Isn't there a shortcut ?

Thanks,
Axelle.
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