If you are going for the minimum number of characters, then this 
(although not particularly efficient) should work:

deep-equal(Title[1]|Date[1]|Author,*)

or (probably more efficient)

count(Title[1]|Date[1]|Author)=count(*)


Oliver Hallam
http://www.xqsharp.com


Costello, Roger L. wrote:
> I was just informed that the predicate [1] is not needed outside the except() function.
>
> So, the super, super XPath is David's solution:
>
>
> ************************************************
>
> Title and Date and empty(* except (Title[1], Date[1], Author))
>
> ************************************************ 
>
>
> Incredible.
>
> /Roger
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