> In my naiveity, I thought that @rend='' would be the 
> equivalent of testing for
> the non-existence of an attribute - however, not(@rend) 
> doesn't appear to work either.

boolean(@rend) is true if the attribute exists
not(@rend) is true if the attribute doesn't exist
@rend='' is true if the attribute exists and has the value "".

Mike Kay

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