> xsl:variable should be updated in next iteration. 

You can not change the value of a variable once it is bound.

I think you just want to test if the rowindex attribute on the current
element is the same as on the previous, in which case you don't need a
variable at all, just

<xsl:if test="@rowindex=preceding-sibling::*/@rowindex">
...



-- 
http://www.dcarlisle.demon.co.uk/matthew

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