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

W.S. Hager wshager at gmail.com
Wed Jan 27 02:09:01 PST 2016

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
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