> 
>  $v1/$v2 does depend on $v1 being empty (or not) doesn't it? 
> Isn't it if empty($v1) then $v2 else ()
> 
> (Just in case you were planning to optimise it away:-)
> 

You are almost right. It also forces the nodes in $v2 to be deduplicated
and in document order (and forces them to be nodes!). And the empty()
condition is the other way around. So I think it is actually

if (empty($v1)) then () else $v2/.

Michael Kay


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