One other thought on this. The reason it is important to know if I 
don't have a match is that there should always be a match and it is 
important to report this state. I suppose I could rearrange the code. 
I was using the otherwise as the default good condition while I 
wanted all the tests to be in the where clauses.

..dan

At 06:58 PM 10/2/2009, you wrote:
>At 05:43 PM 10/1/2009, you wrote:
>>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).
>
>I inherited this stylesheet. After working on this some last night 
>and today, and looking at this answer, I'm not sure why there is 
>this convoluted code. If there is a match on the $sht_num it means I 
>have the value. So I think I can eliminate this test completely and 
>just use the value.
>
>This path was actually used to find a file path with 
>unparsed_entity_uri, this was failing because it was getting an 
>empty string. So I was trying to catch the error before it got to 
>this function.
>
>
>>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.)
>
>
>So that last statement is what I was trying to test for. What is the 
>result of a miss match? Is there a way to test for the results of a 
>match that don't return a result? My two attempts were unable to 
>trap the result of the test and do anything with it. Is there 
>something else I should have tried?
>
>
>---------------------------------------------------------------------------
>Danny Vint
>
>Panoramic Photography
>http://www.dvint.com
>
>voice: 502-749-6179
>
>
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voice: 502-749-6179
     


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