Subject: Re: [xsl] Extract values from first occurrence of a node From: "Matthew Mateyak" <mmateyak@xxxxxxxxxxx> Date: Wed, 16 Jul 2003 12:57:29 -0400 |
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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