> On 13 Oct 2015, at 12:19, Juergen Schoenwaelder > <[email protected]> wrote: > > On Tue, Oct 13, 2015 at 11:45:30AM +0200, Ladislav Lhotka wrote: >> David Reid <[email protected]> writes: >> >>> section 6.3.1 states: >>> >>> If a YANG compiler does not support a particular extension, which >>> appears in a YANG module as an unknown-statement (see Section 14), >>> the entire unknown-statement MAY be ignored by the compiler. >>> >>> If a YANG parser does not support a particular extension, which >>> appears in a YANG module as an unknown-statement (see Section 14), >>> the entire unknown-statement MAY be ignored by the parser. Note >> >> Implications of this statement are still not clear to me. Let's say some >> protocol introduces an extension that is critical for that >> protocol. Does the above sentence mean that an implementation of that >> protocol MAY ignore the extension if it happens to use a parser that >> doesn't support it? >> >> Lada >> >>> that even in this case the semantics associated with the extension >>> still apply (as if they were part of a description statement). >>> > > Did you read the following sentence: > > [...] Note that > even in this case the semantics associated with the extension still > apply (as if they were part of a description statement).
Well, if the parser ignores the extension statement, then the application has no way to find out that the extension is present to be able to apply its semantics. > I think it answers your question with a 'no'. Specifying behaviour of a YANG parser using 2119 keywords YANG parser doesn't make much sense to me, because it all depends on the purpose of the application that uses the parser. Lada > > /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/> -- Ladislav Lhotka, CZ.NIC Labs PGP Key ID: E74E8C0C _______________________________________________ netmod mailing list [email protected] https://www.ietf.org/mailman/listinfo/netmod
