Re: Gen-Art LC review: draft-ietf-netmod-yang-metadata-04

Ladislav Lhotka <lhotka@nic.cz> Fri, 11 March 2016 15:04 UTC

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Subject: Re: Gen-Art LC review: draft-ietf-netmod-yang-metadata-04
From: Ladislav Lhotka <lhotka@nic.cz>
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Date: Fri, 11 Mar 2016 16:04:45 +0100
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> On 11 Mar 2016, at 14:07, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> wrote:
> 
> On Fri, Mar 11, 2016 at 11:15:28AM +0000, tom p. wrote:
>> Lada, Robert
>> 
>> The other angle from which this might be approached is that the I-D
>> already says
>> 
>> "   Using the "type" statement, a type is specified for the annotation
>>   value according to the same rules as for YANG "leaf" type. "
>> 
>> while rfc6020bis says
>> 
>> "   The "leaf" statement is used to define a scalar variable of a
>>   particular built-in or derived type."
>> 
>> so if you know your YANG off by heart, then you will know that
>> annotations must be scalar.  I agree that the text needs to be clearer.
>> Perhaps,
>> OLD
>> "   o  annotations are scalar values and cannot be further structured;"
>> NEW
>> "Annotations obey the same rules as for a YANG "leaf" type [rfc6020bis
>> s.7.6] and so are limited to scalar variables."
> 
> There is no 'leaf type' in YANG. YANG has leaf nodes in the schema
> tree. An annotation is not a node in the schema tree. Perhaps
> something like this:
> 
>  An annotation carries a single value. The type substatement, which
>  must be present, takes as an argument the name of an existing
>  built-in or derived type and the value of the annotation must match
>  this type. See Section 7.4 of [RFC6020bis] for details.

Looks good, thanks. Robert, Tom, do you think this text is sufficient? 

Lada

> 
> /js
> 
> -- 
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>

--
Ladislav Lhotka, CZ.NIC Labs
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