Re: [salud] AD review of draft-ietf-salud-alert-info-urns-12

worley@ariadne.com (Dale R. Worley) Tue, 15 April 2014 01:04 UTC

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Date: Mon, 14 Apr 2014 21:04:01 -0400
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From: worley@ariadne.com (Dale R. Worley)
Sender: worley@ariadne.com (Dale R. Worley)
To: Richard Barnes <rlb@ipv.sx>
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Cc: draft-ietf-salud-alert-info-urns@tools.ietf.org, salud@ietf.org
Subject: Re: [salud] AD review of draft-ietf-salud-alert-info-urns-12
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[as an author]

> From: Richard Barnes <rlb@ipv.sx>

> Some of the values in Section 8.2 have internal colons, which seems like
> you're actually defining two things.  But it's not meaningful to remove the
> final label.  Should these use a different separator?

The idea is that a UA could define a rendering corresponding to
service:recall, and it would cover all three of the defined recall
categories.

> In 8.2.6, do you want a language tag instead of a country?

Oddly, you actually want a country code.  The idea is that ring and
ringback signals will tend to vary depending on the PTT
administration, and those are more organized on national boundries
than on languages.

> It seems like the tables in 9.2.* could be collapsed into one.

The tables could be combined, but each table has different explanatory
material, and combining the tables would make it harder to connect the
explanations with the entries.  We do expect the IANA registration to
use a single table (because the explanations will only be connected
through the RFC reference).

> Section 13 says that the UA MUST provide a "reasonable rendering".   How do
> I tell if a UA meets that criterion?  Might be better to add in Section 11
> a requirement of the form, "if a UA cannot process the set of Alert URNs in
> a message, then it MUST still provide some alert (chosen by local policy).
>  Failure to parse Alert URNs MUST NOT cause a UA not to alert at a all."

Yes, the meaning of "reasonable rendering" is difficult to define.  On
the other hand, the behaviors of the UA that we want to forbid seem
like they would be obvious when one observed it but difficult to
specify.

I'm not even sure that we want to go as far as requiring a noticable
alerting signal was *always* produced -- what if there was a
<urn:alert:priority:silent>?

I think the requirement that the UA must produce an alert unless
specifically requested not to falls under what we have written in
section 13, but maybe it's worth specifying explicitly.  And note that
section 13 is broader than the rule you wrote, since it covers all
combinations of URIs regardless of their scheme.

Dale