Fwd: querying attribute?

[Thomas R. Jones]

The following message was mistakingly only sent to ken. I'm forwarding  
it to the list at his request so that other users may benefit from his  
insight. :)

Thomas

Sent from my iPhone

Begin forwarded message:

> From: "Thomas R. Jones" <http://x-query.com/mailman/listinfo/talk>
> Date: March 18, 2009 2:42:49 PM CDT
> To: "G. Ken Holman" <http://x-query.com/mailman/listinfo/talk>
> Subject: Re:  querying attribute?
>

> Thanks so much for your response ken.
>
> So it is correct to declare and reference namespace prefixes within  
> xquery even though they are not "explicitly" done so in source code?  
> I'm guessing the parser is handling this natively. The XML source is  
> located within an international database and it strips prefix  
> declarations within the import triggers. :(
>
> I'll try this as soon as I get home. Thanks again
>
> Sent from my iPhone
>
> On Mar 18, 2009, at 2:05 PM, "G. Ken Holman" <http://x-query.com/mailman/listinfo/talk 
> > wrote:
>
>> At 2009-03-18 13:06 -0400, Thomas R. Jones wrote:
>>> Hello all, I have the following code:
>>>
>>> <tests xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5">
>>> <rpminfo_test
>>> xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux"
>>> check="all" comment="apache2 is installed"
>>> id="oval:com.maitreyasecurity:tst:674" version="1">
>>> <object object_ref="oval:com.maitreyasecurity:obj:674"/>
>>> <state state_ref="oval:com.maitreyasecurity:ste:500"/>
>>> </rpminfo_test>
>>> </tests>
>>>
>>> I am trying everything i can think of to return the attribute  
>>> value but
>>> am hanging up on the namespace(i think). I believe because the  
>>> attribute
>>> is not prefixed that it is located within a NULL namespace and not  
>>> the
>>> element default namespace declared----correct?
>>
>> Yes, that is correct. *All* unprefixed attributes are in no  
>> namespace, never the default namespace.
>>
>>
>>> Here is my xquery:
>>>
>>> declare default element namespace
>>> "http://oval.mitre.org/XMLSchema/oval-definitions-5#linux"; for  
>>> $attr in
>>> document( 
>>> "apache2.package.novell.maitreyasecurity.en_US.xml","inventory.a")/ 
>>> tests/rpminfo_test/@id return string($attr)
>>>
>>> Ideas?
>>
>> You declare the "#linux" namespace as your default element  
>> namespace, so it is being applied to *every* element (after all, it  
>> is the default) which includes the <tests> element.  Your <tests>  
>> element is in not in the "#linux" namespace, so your problem is it  
>> isn't finding the element with the attribute, not that it isn't  
>> finding the attribute.
>>
>> I tell my students that using the default namespace can be awkward  
>> when dealing with an instance of numerous namespaces (as I learned  
>> the hard way when working with UBL).  I believe it will make  
>> maintenance easier if you explicitly use prefixes when there is  
>> more than one namespace in your source tree.
>>
>> A running example is below ... I hope this helps.
>>
>> . . . . . . . . . Ken
>>
>> t:\ftemp>type thomas.xml
>> <tests xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5">
>> <rpminfo_test
>> xmlns="http://oval.mitre.org/XMLSchema/oval-definitions-5#linux"
>> check="all" comment="apache2 is installed"
>> id="oval:com.maitreyasecurity:tst:674" version="1">
>> <object object_ref="oval:com.maitreyasecurity:obj:674"/>
>> <state state_ref="oval:com.maitreyasecurity:ste:500"/>
>> </rpminfo_test>
>> </tests>
>>
>> t:\ftemp>call xquery thomas.xml thomas.xq
>> <?xml version="1.0" encoding="UTF-8"?>oval:com.maitreyasecurity:tst: 
>> 674
>> t:\ftemp>type thomas.xq
>> declare namespace o =
>>       "http://oval.mitre.org/XMLSchema/oval-definitions-5";
>> declare namespace l =
>>       "http://oval.mitre.org/XMLSchema/oval-definitions-5#linux";
>> for $attr in
>> /o:tests/l:rpminfo_test/@id return string($attr)
>>
>> t:\ftemp>
>>
>>
>> --
>> XQuery/XSLT/XSL-FO training in Los Angeles (New dates!) 2009-06-08
>> Training tools: Comprehensive interactive XSLT/XPath 1.0/2.0 video
>> Video lesson:    http://www.youtube.com/watch?v=PrNjJCh7Ppg&fmt=18
>> Video overview:  http://www.youtube.com/watch?v=VTiodiij6gE&fmt=18
>> G. Ken Holman                 mailto:http://x-query.com/mailman/listinfo/talk
>> Crane Softwrights Ltd.          http://www.CraneSoftwrights.com/q/
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>>
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