Re: [xsl] Extract values from first occurrence of a node

["Matthew Mateyak" <mmateyak@xxxxxxxxxxx>]

Wendell:

OK, I was looking at using keys as well but the problem I was having (and am 
still having regardless of approach) is when I need to do compound matching.

I dont have an AND operator (do I?) to say I want to extract the first <B> 
who's substring() == val1 && substring() == val2 && substring() == val3...

I'd like the use to be multiple substring matched.

I definitely see the approach...makes sense.  Thinking about how I've been 
doing XSL for the last 2 weeks...I could have saved myself alot of code to 
use some of these more concise approaches! ;)

Guess thats what learning is all about!  Good thing I have you guys to help 
me along!

Please let me know what you think about the multiple substring match for USE 
in KEYs.

Thanks,
Matt



> From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
> Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [xsl] Extract values from first occurrence of a node
> Date: Wed, 16 Jul 2003 12:31:26 -0400
>
> Matt,
>
> Although this can be done without them, keys are very useful in XSLT for 
> this kind of operation.
>
> You'd declare a key to match <B> elements, with the string value you care 
> about (your substring) as the key value:
>
> <xsl:key name="B-by-string" match="B" use="substring(.,1,5)"/>
>
> Then the XPath "key('B-by-string','12344')" will get you all <B> elements 
> that have that key value, while "key('B-by-string','12344')[1]" will get 
> you the first of these (in document order). You could of course use a 
> variable as that second argument.
>
> Part of getting your head around XSLT's non-proceduralness is in learning 
> the various ways nodes can be selected, without having to run processes 
> over the set (or find out what processes may have already been run -- in a 
> side-effect free system this isn't appropriate, desirable or generally 
> possible).
>
> Cheers,
> Wendell
>
>  At 12:09 PM 7/16/2003, you wrote:
> > I am trying to translate XML via XSL/XSLT need to specifically extract the 
> > values from the first occurrence of a particular node and ignore the rest 
> > of that same node.
> >
> > I was attempting to use preceding-sibling::nodeset/node to verify if the 
> > match has already been made, but having little luck because I not only 
> > need to match the node but match substrings of the node's value.
> >
> > Example XML:
> >
> > <A>
> > <B>12345 ABCD</B>
> > <B>12344 ABCD</B>
> > <B>12333 EFGH</B>
> > <B>12344 WXYZ</B>
> > </A>
> >
> > What I need to do:
> >
> > Recognize the first <B> with 12344 (substring from 1 with length 5) and 
> > extract ABCD (substring from 7 with length 4), but ignore all other <B>
> >
> > This is a very basic example, the XML I am working with is a bit more 
> > complicated and it is being translated via XSL-FO for PDF generation.
> >
> > The biggest problem I am having with XSL/XSLT is detaching from my 
> > procedural language experience!  From my experience, I am having success 
> > in mapping singlular nodes but more difficulty when trying to accomplish 
> > "decision logic" in a non-procedural manner.
> >
> > Any suggestions or recommended reads would be great.
> >
> > Thanks,
> > Matt
> >
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