Re: [netmod] identityref with multiple base statements (follow-up question)

Lada: thanks a lot for the clarification.

Tom: my understanding is that the 'derived from all' would mean derived from ((aa and bb) or (aa and bb and something else)).

As a non-native English speaker, I would have said 'derived at least from all'.

Anyway, I am satisfied with the mail clarification.

Thanks again

Italo

> -----Original Message-----
> From: tom petch [mailto:ietfc@btconnect.com]
> Sent: giovedì 24 settembre 2020 11:01
> To: Ladislav Lhotka <ladislav.lhotka@nic.cz>; Italo Busi
> <Italo.Busi@huawei.com>; netmod@ietf.org
> Cc: Joey Boyd <joey.boyd@adtran.com>
> Subject: Re: [netmod] identityref with multiple base statements (follow-up
> question)
> 
> From: netmod <netmod-bounces@ietf.org> on behalf of Ladislav Lhotka
> <ladislav.lhotka@nic.cz>
> Sent: 23 September 2020 15:28
> 
> Italo Busi <Italo.Busi@huawei.com> writes:
> 
> > I have a follow-up question about this topic
> >
> > Considering the same identities defined below, what would be the valid
> values the following references?
> >
> > leaf reference-1 {
> >   type identityref {
> >     base base-1;
> >   }
> >   description
> >     "Reference to an identity #1.";
> > }
> >
> > leaf reference-2 {
> >   type identityref {
> >     base base-2;
> >   }
> >   description
> >     "Reference to an identity #2.";
> > }
> >
> > My understanding, is that:
> > - valid values for the reference-1 would be 'a' and 'b'
> > - valid values for the reference-2 would be 'b' and 'c'
> >
> > Is my understanding correct?
> 
> Yes, this should be pretty clear from sec. 9.10.2 of RFC 7950.
> 
> <tp>
> Well, may be.  I saw this come up some time ago and read RFC7950 and was
> unsure.
> 
> It is 'derived from all' that gave me pause.  With aa and bb as base, does that
> mean derived from aa and bb or derived from aa or bb?  Should that be
> 'derived from any'?
> 
> Tom Petch
> 
> Lada
> 
> >
> > Thanks, Italo
> >
> >> -----Original Message-----
> >> From: Ladislav Lhotka [mailto:ladislav.lhotka@nic.cz]
> >> Sent: lunedì 3 agosto 2020 10:45
> >> To: Joey Boyd <joey.boyd@adtran.com>; netmod@ietf.org
> >> Subject: Re: [netmod] identityref with multiple base statements
> >>
> >> Joey Boyd <joey.boyd@adtran.com> writes:
> >>
> >> > Hi,
> >> >
> >> > I am looking for some clarification regarding RFC 7950 section 9.10.2,
> >> specifically this statement.
> >> >
> >> > Valid values for an identityref are any identities derived from all the
> >> identityref's base identities.
> >> >
> >> > Example:
> >> >
> >> > identity base-1 {
> >> >   description
> >> >     "Base identity #1.";
> >> > }
> >> >
> >> > identity base-2 {
> >> >   description
> >> >     "Base identity #2.";
> >> > }
> >> >
> >> > identity a {
> >> >   base base-1;
> >> >   description
> >> >     "Identity A.";
> >> > }
> >> >
> >> > identity b {
> >> >   base base-1;
> >> >   base base-2;
> >> >   description
> >> >     "Identity B.";
> >> > }
> >> >
> >> > identity c {
> >> >   base base-2;
> >> >   description
> >> >     "Identity C.";
> >> > }
> >> >
> >> > leaf reference {
> >> >   type identityref {
> >> >     base base-1;
> >> >     base base-2;
> >> >   }
> >> >   description
> >> >     "Reference to an identity.";
> >> > }
> >> >
> >> > The question is how to determine the value space for this identityref.
> >> >
> >> > Option #1:
> >> > The value space is any identity which is derived from both base identities.
> >> This means the only valid value in the example would be 'b'.
> >> >
> >> > Option #2:
> >> > The value space is any identity which is derived from either base identity.
> >> This means the valid values are 'a', 'b' and 'c'.
> >> >
> >> > The phrasing "...derived from all the identityref's base identities." tends
> to
> >> point to Option #1 but I would like clarification on the intent.
> >>
> >> Yes, #1 is correct.
> >>
> >> Lada
> >>
> >> >
> >> > Best regards,
> >> > Joey
> >> >
> >> > _______________________________________________
> >> > netmod mailing list
> >> > netmod@ietf.org
> >> > https://www.ietf.org/mailman/listinfo/netmod
> >>
> >> --
> >> Ladislav Lhotka
> >> Head, CZ.NIC Labs
> >> PGP Key ID: 0xB8F92B08A9F76C67
> >>
> >
> 
> --
> Ladislav Lhotka
> Head, CZ.NIC Labs
> PGP Key ID: 0xB8F92B08A9F76C67
> 
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