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[xsl] Simple question? element value last() - element value (first)

From: j milo taylor <milo@---------->
To:
Date: 8/4/2008 1:34:00 PM

This is, I think, pretty simple, but I'm just not getting it.



I want to output a number value = x



where



x = last <Work_Year> - first <Work_Year>



///



I'm applying



<xsl:template match="artist_works">

<xsl:for-each select="works_details">

      
       <xsl:value-of select="Work_Year[last()] - Work_Year[1]"/>

       </xsl:for-each>

</xsl:template>



///



on the following XML



///



<artist_works>



<works_details>
<Work_ID>1</Work_ID>
<Work_Year>1945</Work_Year>
</works_details>

<works_details>
<Work_ID>2</Work_ID>
<Work_Year>1958</Work_Year>
</works_details>

<works_details>
<Work_ID>3</Work_ID>
<Work_Year>1972</Work_Year>
</works_details>

</artist_works>



All I'm getting is "000", where in this example it should be "27" i.e 
1972-1945



Can anyone advise?



Best Regards
J Milo Taylor

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[xsl] Simple question? element value last() - element value (first)