Juergen Schoenwaelder <[email protected]> wrote:
> On Thu, May 12, 2016 at 09:28:25AM +0000, Bogaert, Bart (Nokia - BE) wrote:
> > Juergen,
> >
> > Thanks for the feedback.
> > With respect to functions available when using XPATH: XPATH 1.0 refers to a
> > Core Function Library. All the functions defined in there (Node set
> > functions, string functions, Boolean and number functions) are available in
> > a YANG XPATH context?
>
> The YANG specification refers to XPath 1.0 and
>
> https://www.w3.org/TR/1999/REC-xpath-19991116/#corelib
>
> (section 4 Core Function Library) says
>
> This section describes functions that XPath implementations must
> always include in the function library that is used to evaluate
> expressions.
>
> and hence I think a compliant implementation must support the XPath
> 1.0 Core Function Library.
>
> > How wide-spread XPATH 2.0 and 3.0 is I also do not have an idea (I'm
> > currently "playing" with BaseX and there these versions are supported as far
> > as I know) but the fact that there are multiple versions of the standard can
> > cause confusion about what is "in" and what is "not in".
>
> As far as I understand, libxml2 does not support XPath 2.0 (or 3.0)
> and having a well maintained open source XPath 2.0 implementation in C
> is likely of some importance.
>
> > So if, for
> > RFC6020bis, the supported set of functions is:
> > 1. the Core Function library of XPATH 1.0
> > 2. the added functions listed in RFC6020bis
> > We could conclude that the functionality is "confined". Maybe a statement
> > about full support of the Core Function Library of XPATH 1.0 in the RFC
> > could take away that ambiguity?
>
> I agree that it is not explicitely stated that YANG 1.1 requires the
> support of 1. and 2.
See section 6.4.1 of 6020bis, where it explicitly says:
o The function library is the core function library defined in
[XPATH], and the functions defined in Section 10.
/martin
> (see above) but if you follow the references to
> XPath 1.0, I think it is implicitely clear.
>
> /js
>
> --
> Juergen Schoenwaelder Jacobs University Bremen gGmbH
> Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany
> Fax: +49 421 200 3103 <http://www.jacobs-university.de/>
>
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