>    count(Title) eq 1 and
>    count(Author) ge 0 and
>    count(Date) eq 1 and
>    count(*[not(name() = ('Title','Author','Date'))]) eq 0

It's often inefficient to use count, and always inefficient and
namespace unsafe to use name() and string comparisons. 

I'd use

Title and Date and empty(* except (Title[1],Date[1],Author))


David

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