[xquery-talk] querying an xml file with namespaces

[Michaël Michaud]

Thank you Wolfgang,

You helped me to understand how it works.
Now I must have a closer look at the XQuery functions syntax.
I also noticed some namespace-relative methods in the xom Element class, 
which may be helpful.

Michaël

Wolfgang Hoschek a écrit :

> On Jan 11, 2006, at 2:17 PM, Michaël Michaud wrote:
>
>> Hello,
>>
>> I try to query an xml file with nux XQueryUtil.
>> First time, i get messages such as
>>  "Prefix md has not been declared"
>>
>> I could get the result by adding something like
>>  "declare namespace md="http://www.isotc211.org/2005/gmd";"
>> in front of my query string.
>
>
> That's the standard and hence recommended way of doing it.
>
>>
>> Now I try to read the namespaces first with another query
>>  XQueryUtil.xquery(node, "//namespace::*")
>> to automatically add the namespaces in front of my main query,
>> but I get the message :
>>  "The namespace axis is not available in XQuery"
>
>
> This simply won't work. The namespace axis has been deprecated by the  
> W3C, so Saxon followed suit and disabled it a few releases ago by  
> toggling an internal flag. Namespaces continue to be available  
> supported, of course. It's just the namespace axis iteration that's  
> gone.
>
>>
>> Question : what is the simple method to query an xml file using
>> namespaces ?
>
>
> Depends on what you're trying to do.
>
> You could write yourself a Java method or XQuery function that  
> computes the namespaces in scope for a given element, then precede  
> the query with the relevant declarations. For example, using standard  
> XQuery functions such as fn:namespace-uri(Node) or similar.
>
> The best solution might be to argue on the XOM mailing list for a  
> public method returning the namespace declarations of a XOM  
> XPathContext, such as nu.xom.XPathContext.toMap(). If this would be  
> public I'd consider adding a query method that takes an XPathContext  
> as additional input parameter, similar to the XOM XPath functionality.
>
> Wolfgang.
>
>
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