[xquery-talk] Function for determining one XPath as subset of another

[W.S. Hager]

Or simplified: is the set selected by p1 equal to the set selected by p2?

2016-01-27 11:09 GMT+01:00 W.S. Hager <wshager at gmail.com>:

> Isn't the constraint in this case the test: is p2 a subset of p1?
>
> 2016-01-27 11:04 GMT+01:00 Pavel Velikhov <pavel.velikhov at gmail.com>:
>
>>
>> > On 27 Jan 2016, at 12:54, W.S. Hager <wshager at gmail.com> wrote:
>> >
>> > Can't we formally proof something as obvious Adam's case?
>>
>> In Adam’s case we want to test whether path expression p1 subsumes path
>> expression p2.
>> If we don’t put any conditions on p1 and p2, the problem is undecidable:
>> p1 and p2 may include
>> function calls, so the expressive power of p1 and p2 are that of a Turing
>> Machine.
>
>
>
>
> --
>
> W.S. Hager
> Lagua Web Solutions
> http://lagua.nl
>



-- 

W.S. Hager
Lagua Web Solutions
http://lagua.nl
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