Dan,

At 04:04 PM 10/1/2009, you wrote:
>I have a structure where I need to match values between w element 
>attributes. These elements are in different parst of the document. 
>Problem I'm trying to solve is when there is a typo in one of the 
>attributes and there is no match. I thought this would do it, but it's not
><xsl:when 
>test="ancestor::ipb/figure/subfig/graphic[@boardno=$sht_num]/@boardno">
>
>same with this
>
><xsl:when 
>test="ancestor::ipb/figure/subfig/graphic[@boardno=$sht_num]/@boardno = ''">
>
>Any suggestions?

I think you probably want 
"ancestor::ipb/figure/subfig/graphic/@boardno=$sht_num" as a positive 
test -- this will be true if there is a match (there exists a 
graphic/@boardno in that place whose value is $sht_num).

This is a somewhat more direct version of your first effort, which is 
true when there are ancestor::ipb/figure/subfig/graphic elements 
whose @boardno = $sht_num, by virtue of the fact that they 
(necessarily) have a @boardno. But I'm not sure you want a positive 
test: your description suggests you want to know when there isn't.

Your second attempt can be true only if $sht_num is "", and never 
otherwise. (It will also fail if no graphic elements are found on that path.)

If you want a negative test, which will come back true if there is no 
graphic whose @board_no is $sht_num, the way to do that is

test="not(ancestor::ipb/figure/subfig/graphic/@boardno=$sht_num)"

Or, of course, you can use the xsl:otherwise clause.

Good luck,
Wendell

>Here is the doc structure:
>
><ipb>
>   <figure>
>     <subfig>
>       <graphic boardno='a'/>
>     </subfig>
>   </figure>
>   <table>
>     <row>
>       <entry><ipbilus><xref shtref='b'/></ipbilus>
>       </entry>
>     </row>
>   </table>
></ipb>
>
>$sht_num is set to xref/@shtref so b never finds a on graphic


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Wendell Piez                            mailto:wapiez@m...
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