xpath problem

Hi,

I've got stuck on something I thought should be quite simple: I need
to select all elements of type foo which do not have an ancestor
with attribute bar.

I've been trying endless permutations, along the lines of:
 <xsl:for-each select="///foo[not(ancestor::*[@bar])]">

and none of which work... I imagine the problem is with trying to use the
ancestor axis in this expression (although the above parses ok), but I
can't see a one-line way to do it otherwise. Any suggestions?

Thanks
Graham


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