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Re: [core] Comments on draft-ietf-core-yang-cbor-00

Ladislav Lhotka <lhotka@nic.cz> Mon, 23 May 2016 12:06 UTC

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From: Ladislav Lhotka <lhotka@nic.cz>
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Date: Mon, 23 May 2016 14:06:27 +0200
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To: Carsten Bormann <cabo@tzi.org>
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Subject: Re: [core] Comments on draft-ietf-core-yang-cbor-00
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> On 23 May 2016, at 13:14, Carsten Bormann <cabo@tzi.org> wrote:
> 
> Ladislav Lhotka wrote:
>>> We were thinking about possibly adding CBOR tags to disambiguate this.
>> 
>> This might be a good idea anyway because resolving a union type may
>> involve, e.g., (repeated) regular expression matching.
> 
> Right, minimizing the complexity of the matcher is a good objective.
> 
> Now, how do we use tags to identify the alternatives in the union?
> As far as I understand, these can be moved around when the module is
> updated.
> How do people handle this in their software?

I think they mostly follow the procedure as specified in 6020. Unions are usually not defined to make this really hard. For unions like "inet:host" or "inet:ip-address" it often needn't be done at all because many library functions directly accept all member types.

Lada

> 
> Grüße, Carsten
> 

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Ladislav Lhotka, CZ.NIC Labs
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