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[xsl] summing preceding attribute values

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I have the following layout:

<row>
  <cell span='2'>
    Foo1
  </cell>
  <cell span='3'>
    Foo2
  </cell>
  <cell span='4'>
    Foo3
  </cell>
</row>

Within the <row>, on any given cell, I need to know the sum of the span
attributes on the preceding cells.  For example, when I am in the "Foo3"
cell, I need to know that the previous span count is 5.

I am trying different combinations of sum, but can only get the immediately
preceding span and not the sum of all preceding spans.  I am using
something like:

<xsl:value-of select="sum(preceding-sibling::cell[@span]/ @span)"/>

This does not work.  Any ideas on what I am doing wrong?

-Lou

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