Re: [netmod] WG LC draft-ietf-netmod-module-tags-02 - 10/2/18 - 10/16/18

Martin Bjorklund <mbj@tail-f.com> Wed, 17 October 2018 10:42 UTC

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Date: Wed, 17 Oct 2018 12:42:26 +0200 (CEST)
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From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] WG LC draft-ietf-netmod-module-tags-02 - 10/2/18 - 10/16/18
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Christian Hopps <chopps@chopps.org> wrote:
> 
> 
> > On Oct 16, 2018, at 7:39 PM, Andy Bierman <andy@yumaworks.com> wrote:
> > 
> > 
> > 
> > On Tue, Oct 16, 2018 at 3:15 PM, Christian Hopps <chopps@chopps.org> wrote:
> > 
> > Andy Bierman <andy@yumaworks.com> writes:
> > 
> > This draft needs to define the module-tag encoding wrt/
> >    - valid characters (e.g., some subset of UTF-8)
> >    - min/max length (e.g., implementation MUST support at least 64 chars
> > and can support larger)
> > 
> > I'm looking for suggestions on how to do this subset. We had intended to allow for as wide as possible content; however, I think disallowing tabs, newlines, carriage returns is more than reasonable. Has a type like this already been standardized or is there an example available somewhere?
> > 
> > I suppose yang-identifier type is too restrictive so I will agree that restricting whitespace and colon chars
> > is probably good enough 
> 
> 
> I'm going to use:
> 
>   typedef tag {
>     type string {
>       pattern '[a-zA-Z_][a-zA-Z0-9\-_]*:[\S ]+';

Ok.  Note that the legal characters in "string" are different in YANG
version 1 and 1.1, so this is a good reason (theoretical perhaps) to
use 1.1.

I do think that this module should be 1.1.  A number of fixes were
done in 1.1, and unless there are strong reasons not to use 1.1, you
should use it.  The string type is one example, and the effect on the
size of <hello> in NETCONF is another.


/martin


>       length "1..max";
>     }
>     description
>       "A tag value is composed of a standard prefix followed
>        by any string value that does not include carriage return,
>        form-feed, newline or tab characters."
>   }
> 
> I left in space -- lot's of people in the non-unix world use spaces.
> 
> Thanks,
> Chris.
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