Re: [netmod] yang-data-ext issues
Joe Clarke <jclarke@cisco.com> Mon, 16 April 2018 13:34 UTC
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To: Martin Bjorklund <mbj@tail-f.com>, netmod@ietf.org
References: <20180416.145617.1262098657698751846.mbj@tail-f.com>
From: Joe Clarke <jclarke@cisco.com>
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Date: Mon, 16 Apr 2018 09:33:24 -0400
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Subject: Re: [netmod] yang-data-ext issues
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On 4/16/18 08:56, Martin Bjorklund wrote: > Hi, > > While preparing draft-ietf-netmod-yang-data-ext-02, it turned out that > it is not clear what, if any, restrictions should be enforced for > yang-data structures. Even among the authors we have different ideas > for how this should work. > > Background: > > In 8040, the original yang-data extension had a restriction that said > that a yang-data structure MUST have exactly one container, since it > wouldn't be possible to have a yang-data structure in an XML instance > document otherwise. > > Since people want to use yang-data structures in other places, this > restriction was lifted in the new draft: > > There is no longer an assumption that a yang data structure can > only be used as a top-level abstraction, instead of nested within > some other data structure. > > > With this in mind, here's a use case that I think we ought to support: > > rpc my-first-rpc { > description > "Bla bla... > If an error occurs, <error-info> will contain an instance of > the yang-data structure 'my-first-rpc-error-info'."; > ... > } > > yang-data my-first-rpc-error-info { > leaf reason { ... } > container user-info { ... } > } > > rpc my-second-rpc { > description > "Bla bla... > If an error occurs, <error-info> will contain an instance of > the yang-data structure 'my-second-rpc-error-info'."; > ... > } > > yang-data my-second-rpc-error-info { > leaf reason { ... } > leaf important-url { ... } > } > > (maybe in the future we could even have a YANG extension statement to > formalize the description: > > rpc my-first-rpc { > ... > opx:error-info-structure my-first-rpc-error-info; > } > > but this is not point now.) > > In the example above, note that the leaf "reason" is present in both > structures. IMO this is not a problem, since these structures are > used in different contexts. > > My point is that I think we should impose as few restrictions as > possible to the yang-data extension. It should be up to the user of > yang-data to ensure that the structure is defined in such a way so > that it can be used properly. For example, a structure that is > supposed to describe an XML instance document cannot define two leafs > at the top level. > > If the WG agrees with what I wrote above, we need to change the > augment-yang-data extension so that you would write for example: > > yx:augment-yang-data /ex:my-first-rpc-error-info/ex:user-info { > ... > } > > Comments? I found the "single container only" policy to be too restricting. I was modeling data that would [typically] be serialized to something other than XML, and this just made me jump through more hoops than I wanted to use rc:yang-data. I agree with your laissez-faire proposal here. I think there should be some text to the same effect about how it is up to the author of the yd:yang-data elements to make sure the modeled data can be encoded as they require. Joe
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Joe Clarke
- Re: [netmod] yang-data-ext issues Kent Watsen
- [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Joe Clarke
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Robert Wilton
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Robert Wilton
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Robert Varga
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Robert Varga
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Robert Varga
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Andy Bierman
- [netmod] Extensions vs new YANG versions [was Re:… Robert Wilton
- Re: [netmod] yang-data-ext issues Robert Wilton
- Re: [netmod] Extensions vs new YANG versions [was… Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Robert Wilton
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Robert Wilton
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Robert Wilton
- Re: [netmod] yang-data-ext issues Martin Bjorklund
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Ladislav Lhotka
- Re: [netmod] yang-data-ext issues Robert Varga
- Re: [netmod] yang-data-ext issues Robert Varga
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Juergen Schoenwaelder
- Re: [netmod] yang-data-ext issues Andy Bierman
- Re: [netmod] yang-data-ext issues Kent Watsen
- Re: [netmod] yang-data-ext issues Ladislav Lhotka