[xsl] FOP sum

Hi!

I need to accumulate and list the total. Can't seem to get it working

I did the following :-

<xsl:value-of select="sum(/ACT/DESC/AMT)"/>

Thanks

Dave

<ACT>
<DESC>
<AMT>
10
</AMT>
</DESC>
<DESC>
<AMT>
15
</AMT>
</DESC>
<DESC>
<AMT>
20
</AMT>
</DESC>
<DESC>
<AMT>
30
</AMT>
</DESC>
</ACT>

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