Re: [netconf] [core] YANG encoding in CBOR
Andy Bierman <andy@yumaworks.com> Sun, 24 March 2019 11:30 UTC
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From: Andy Bierman <andy@yumaworks.com>
Date: Sun, 24 Mar 2019 04:29:45 -0700
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To: Carsten Bormann <cabo@tzi.org>
Cc: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, "netconf@ietf.org" <netconf@ietf.org>, "core@ietf.org" <core@ietf.org>
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Subject: Re: [netconf] [core] YANG encoding in CBOR
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On Sun, Mar 24, 2019 at 2:47 AM Carsten Bormann <cabo@tzi.org> wrote: > On Mar 23, 2019, at 14:35, Juergen Schoenwaelder < > j.schoenwaelder@jacobs-university.de> wrote: > > > > RFC 7950 section 9.12: > > Thank you, this is very useful. > > Let me try to ask my other question in a very concrete way: > > If I have > > > typedef foo { > > type union { > > type enumeration { > > enum red { value 1; } > > enum breen { value 2; } > > enum glue { value 3; } > > } > > type enumeration { > > enum tacks { value 1; } > > enum nails { value 2; } > > enum glue { value 3; } > > } > > } > > } > > in one place, and > > > typedef bar { > > type union { > > type enumeration { > > enum red { value 1; } > > enum breen { value 2; } > > enum glue { value 3; } > > } > > type enumeration { > > enum sparkling { value 1; } > > enum blinking { value 2; } > > enum steady { value 3; } > > } > > } > > } > > in another place, is the value “red” between the two types referring to > the “same thing”? > > no -- and this is not an error, although it is position-dependent: typedef baz { type union { type foo; type bar; } } The issue for CBOR applies to both bits and enumerations. The probability of 2 enum names clashing is almost zero. The probability of 2 value-stmts clashing is almost 100% The answer seems to be simple but inefficient: Always encode bits or enumeration as a string, if this is within a union type. There are not many of these -- more likely to find strings with different patterns where first-match-wins is no different than before (for XML) > If there were a typedef for the two anonymous enumerations that both look > the same, as in > > typedef color { > > type enumeration { > > enum red { value 1; } > > enum breen { value 2; } > > enum glue { value 3; } > > } > } > > and that typedef being referenced from both unions instead of copy-pasting > it, would that change the answer? > > I think first-match-wins still dictates the result. The JSON issue (and maybe CBOR) is what Juergen is talking about: typedef maybe-first { type union { type string; type int32; } } Use 42 as an example... The XML encoding <foo>42</foo> will always match string. The JSON (or CBOR) encoding { "foo": 42 } will always match int32 We want YANG data to maintain fidelity and still be encoding-independent, but this is broken for union types. Grüße, Carsten > > Andy > _______________________________________________ > core mailing list > core@ietf.org > https://www.ietf.org/mailman/listinfo/core >
- Re: [netconf] YANG encoding in CBOR Ladislav Lhotka
- Re: [netconf] [core] YANG encoding in CBOR Ladislav Lhotka
- Re: [netconf] YANG encoding in CBOR Juergen Schoenwaelder
- Re: [netconf] [core] YANG encoding in CBOR Andy Bierman
- [netconf] YANG encoding in CBOR Rob Wilton (rwilton)
- Re: [netconf] YANG encoding in CBOR Michel Veillette
- Re: [netconf] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] [core] YANG encoding in CBOR Andy Bierman
- Re: [netconf] [core] YANG encoding in CBOR Juergen Schoenwaelder
- Re: [netconf] YANG encoding in CBOR Rob Wilton (rwilton)
- Re: [netconf] YANG encoding in CBOR Rob Wilton (rwilton)
- Re: [netconf] YANG encoding in CBOR Michel Veillette
- Re: [netconf] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] YANG encoding in CBOR Juergen Schoenwaelder
- Re: [netconf] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] YANG encoding in CBOR Juergen Schoenwaelder
- Re: [netconf] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] [core] YANG encoding in CBOR Andy Bierman
- Re: [netconf] [core] YANG encoding in CBOR Juergen Schoenwaelder
- Re: [netconf] [core] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] [core] YANG encoding in CBOR Andy Bierman
- Re: [netconf] [core] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] [core] YANG encoding in CBOR ivaylo petrov
- Re: [netconf] [core] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] [core] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] YANG encoding in CBOR Ladislav Lhotka
- Re: [netconf] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] YANG encoding in CBOR Ladislav Lhotka
- Re: [netconf] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] YANG encoding in CBOR Ladislav Lhotka
- Re: [netconf] YANG encoding in CBOR Michel Veillette
- Re: [netconf] YANG encoding in CBOR Juergen Schoenwaelder
- Re: [netconf] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] YANG encoding in CBOR Ladislav Lhotka
- Re: [netconf] YANG encoding in CBOR Michel Veillette
- Re: [netconf] YANG encoding in CBOR Michel Veillette
- Re: [netconf] [core] YANG encoding in CBOR Andy Bierman
- Re: [netconf] [core] YANG encoding in CBOR Ladislav Lhotka
- Re: [netconf] [core] YANG encoding in CBOR Andy Bierman
- Re: [netconf] YANG encoding in CBOR Carsten Bormann
- Re: [netconf] YANG encoding in CBOR Michel Veillette
- Re: [netconf] YANG encoding in CBOR Juergen Schoenwaelder
- Re: [netconf] [core] YANG encoding in CBOR ivaylo petrov
- Re: [netconf] YANG encoding in CBOR Andy Bierman
- Re: [netconf] YANG encoding in CBOR Juergen Schoenwaelder
- Re: [netconf] YANG encoding in CBOR Andy Bierman
- Re: [netconf] YANG encoding in CBOR Michel Veillette