Re: [PHP-XML-DEV] DomXPath and default XML namespaces

On 14.12.2004 6:45 Uhr, Dan Phiffer wrote:
> Adam Maccabee Trachtenberg wrote:
> 
>> This is an XPath FAQ. Without a ns prefix, XPath doesn't choose
>> elements living in the default ns, but ones living in no namespace.
> 
> 
> Are there any good references you might point me to? I'm pretty new to 
> this stuff and beyond my "in a Nutshell" book don't have many places to 
> consult yet.
> 
> 
>  > what happens to:
> 
>>
>> <root>
>>   <foo>
>>     <qxx/>
>>   </foo>
>>   <foo xmlns="bar">
>>    <qxx/>
>>   </foo>
>> </root>
>>
>> And /root/foo/qxx? Do you select qxx in the default ns? Or not?
>>
>> -adam
>>
> 
> That makes perfect sense. I'm realizing that XPaths are not as portable 
> as I thought they were. At least not without some way of converting 
> element prefixes easily...

You just have to learn that prefixes are just aliases to the real 
namespaces, then you're fine. Don't count on prefixes, they itself are 
meaninngless. And always use registerNamespace() for all namespaces you 
need in the XPath query. Then XPath is very portable.

chregu

> 
> Thanks,
> -Dan
> 

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