A decent optimizer will convert count(XXX)=0 to empty(XXX), but you run the risk that without a decent optimizer, the processor will carefully count how many items satisfy the predicate rather than returning a result as soon as it finds the first.
Michael Kay
Saxonica
> On 10 Jul 2018, at 23:06, Peter Flynn <peter@silmaril.ie> wrote:
>
> On 10/07/18 22:42, Costello, Roger L. wrote:
>> Hi Folks,
>>
>> So, you’ve got an XML document containing a bunch of integers:
>>
>> <Test>
>> <x>2</x>
>> <x>4</x>
>> <x>5</x>
>> <x>7</x>
>> <x>10</x>
>> …
>> </Test>
>>
>> You want to know: Is it true that not all the integers are even?
>
> I'd test if count(Test/x[. mod 2 gt 0])=0
>
> But I don't know if there is a penalty in processing that compared with
> the more complex solutions.
>
> ///Peter
> --
> Peter Flynn | Principal Consultant | Silmaril Consultants | Cork 🇮🇪
> Ireland | ☎ +353 86 824 5333 | ✉ peter@silmaril.ie | 🌍
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>
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