testing for descendants problem

Hi-
 I need to check if there are ancestor element nodes of an element node
which contains @task=$taskNumber, so I have:

<xsl:when test="descendant::*[(_at_)task = $taskNumber]">
        ... do something
</xsl:when>

...no problem so far...but I also want to make sure that this ancestor
element node does not have an @result attribute. I can't figure out how
to do that. Can someone please help? Thanks-
 Mac


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