Re: [MMUSIC] Comments on draft-ietf-mmusic-traffic-class-for-sdp-02

At 09:06 PM 11/2/2012, Charles Eckel (eckelcu) wrote:
>Please see inline.
>
> > -----Original Message-----
> > From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On
> > Behalf Of Paul Kyzivat
> > Sent: Thursday, November 01, 2012 8:05 PM
> > To: IETF MMUSIC WG
> > Subject: [MMUSIC] Comments on draft-ietf-mmusic-traffic-class-for-sdp-02
> >
> > I have some comments on this new version of the document. (Sorry!)
> >
> > Section 3:
> >
> > I know we have been through this many times, and its much better now.
> > But I still see one issue:
> >
> > The ABNF says an adjective is a tcl-token, which allows "-" and
> > alphanumerics. But then the text says that an adjective and be preceded
> > by underscore ("_") to indicate that it is non-standard. This means you
> > are *extending* the syntax in text beyond what the ABNF allows. IMO that
> > is a very bad idea.
> >
> > Instead, I recommend altering the syntax to permit the underscore in
> > adjectives in the way you intend it to be used. I would suggest some
> > syntax for this but I don't know if you want to permit non-standard
> > qualified adjectives.
>
>I'd like to recommend removing the text regarding the '_' and 
>leaving the ABNF as is. At IETF 84 I thought we agreed to address 
>this by lowering the bar to register a new adjective.

The -03 version at 
http://hive.packetizer.com/users/paulej/internet-drafts/draft-ietf-mmusic-traffic-class-for-sdp-03.txt 
has removed the '_' from all the text.

>Cheers,
>Charles
>
> > Also, as we have previously discussed, this way of using non-standard
> > adjectives is quite analogous to the use "P-" or "X-" headers that has
> > been found troublesome and generally banned. So I expect this might have
> > trouble getting through IESG review. I thought we had discussed having
> > the non-standard adjectives be registered using a
> > first-come-first-served registration policy.
> >
> > ISTM that the portion of this section that discusses "aq" ought to be in
> > its own section, and then referenced from the iana considerations section.
> >
> > Section 6.4:
> >
> > I don't find any explanation of how or if to register qualified
> > adjectives. The section title says "Unqualified Adjective Registration",
> > but the inital set of registered values includes "aq" (the qualifier
> > part of qualified adjectives), and some values intended to be qualfied
> > by "aq:" (such as "admitted"). This certainly implies to me that I can
> > use each of these as an unqualified adjective.
> >
> > If the intent is to register such things then I would expect to see the
> > full qualified adjectives listed for registration. E.g. "aq:admitted"
> >
> >       Thanks,
> >       Paul
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