Re: [netmod] ?==?utf-8?q? mandatory choice with non-presence container case
Andy Bierman <andy@yumaworks.com> Mon, 24 June 2019 17:11 UTC
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From: Andy Bierman <andy@yumaworks.com>
Date: Mon, 24 Jun 2019 10:11:39 -0700
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To: Michal Vaško <mvasko@cesnet.cz>
Cc: "Rob Wilton (rwilton)" <rwilton@cisco.com>, netmod <netmod@ietf.org>
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Subject: Re: [netmod] ?==?utf-8?q? mandatory choice with non-presence container case
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On Mon, Jun 24, 2019 at 10:01 AM Michal Vaško <mvasko@cesnet.cz> wrote: > Hi Rob, > I think there is a problem in the RFC because using only allowed steps I > got invalid data from initially valid data. That cannot be correct. > > No. See sec. 7.5.7 If a non-presence container does not have any child nodes, the container may or may not be present in the XML encoding. Just because your retrieval does not contain the NP-container, that does not mean the NP-container was not present in the server for the mandatory-stmt validation. Regards, > Michal > > Andy > On Monday, June 24, 2019 18:52 CEST, "Rob Wilton (rwilton)" < > rwilton@cisco.com> wrote: > > > Hi Michal, > > > > My thoughts: > > > > According to 7.5.1: > > > > In the first style, the container has no meaning of its own, existing > > only to contain child nodes. In particular, the presence of the > > container node with no child nodes is semantically equivalent to the > > absence of the container node. YANG calls this style a "non-presence > > container". This is the default style. > > > > Hence your request (because the NP container does not have any children) > is equivalent to: > > > > <TOP> > > <L/> > > </TOP> > > > > which fails the "mandatory" check. > > > > Thanks, > > Rob > > > > > > > -----Original Message----- > > > From: netmod <netmod-bounces@ietf.org> On Behalf Of Michal Vaško > > > Sent: 24 June 2019 17:39 > > > To: netmod <netmod@ietf.org> > > > Subject: [netmod] mandatory choice with non-presence container case > > > > > > Hi, > > > I have encountered a situation that I think is not covered by RFC > 7950. My > > > specific use-case was as follows. > > > > > > model: > > > > > > container TOP { > > > leaf L { > > > type empty; > > > } > > > choice A { > > > mandatory true; > > > container C; > > > } > > > } > > > > > > data: > > > > > > <TOP> > > > <L/> > > > <C/> > > > </TOP> > > > > > > Parsing was successful, but printing these data back to XML produced: > > > > > > <TOP> > > > <L/> > > > </TOP> > > > > > > and parsing this correctly failed with missing mandatory choice. > According > > > to section 7.5.7 [1], I think the C container could be omitted but the > > > whole situation does not seem correct. Thank you for any input. > > > > > > Regards, > > > Michal > > > > > > [1] https://tools.ietf.org/html/rfc7950#section-7.5.7 > > > > > > _______________________________________________ > > > netmod mailing list > > > netmod@ietf.org > > > https://www.ietf.org/mailman/listinfo/netmod > > > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod >
- [netmod] mandatory choice with non-presence conta… Michal Vaško
- Re: [netmod] mandatory choice with non-presence c… Rob Wilton (rwilton)
- Re: [netmod] ?==?utf-8?q? mandatory choice with n… Michal Vaško
- Re: [netmod] ?==?utf-8?q? mandatory choice with n… Andy Bierman
- Re: [netmod] ?==?utf-8?q? ?==?utf-8?q? ?= mandato… Michal Vaško
- Re: [netmod] ?==?utf-8?q? mandatory choice with n… Qin Wu
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Kent Watsen
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Ladislav Lhotka
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Martin Bjorklund
- Re: [netmod] ?= mandatory choice with non-presenc… Rob Wilton (rwilton)
- Re: [netmod] ?==?utf-8?q? ?==?utf-8?q? ?= mandato… Michal Vaško
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Ladislav Lhotka
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Martin Bjorklund
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Ladislav Lhotka
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Rob Wilton (rwilton)
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Ladislav Lhotka
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Rob Wilton (rwilton)
- Re: [netmod] ?= ?==?utf-8?q? mandatory choice wit… Christian Hopps