Re: [salud] Section 13
Paul Kyzivat <pkyzivat@alum.mit.edu> Fri, 09 May 2014 00:09 UTC
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Date: Thu, 08 May 2014 20:09:03 -0400
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Subject: Re: [salud] Section 13
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On 5/8/14 4:13 PM, Dale R. Worley wrote: > [as an author] > > Acting on Ben Campbell's suggestion that we consider revising the > first sentence of section 13 so that it can support a MUST, I've > written a revision: > > [In this message, I've separated the three sentences to make > comparisons easier; it is all one paragraph. I changed "explicitly > instructed" to "instructed" in sentence 3.] > > 13. User Agent Behaviour > > The User Agent (UA) must produce a reasonable rendering > regardless of the combination of URIs (of any schemes) in the > Alert-Info header field: > > It MUST produce a rendering based on the URIs that it can > understand and act on (if any), interpreted as prescribed by > local policy, and ignore the other URIs. > > In particular, unless the containing message is a request and is > immediately rejected, the UA SHOULD provide some alert unless it > is instructed not to (for example, by Alert-Info URIs that it > understands, the presence of a Replaces or Joins header field, > local policy, or direction of the user). > > What do people think? > > I think that sentence 2 is really what we intended by sentence 1. I > left in sentence 1 to give guidance to the overall idea, while > sentence 2 gives the details. Sentence 3 is also needed. Sentence 2 doesn't cover the case where none of the URNs are understood. Thanks, Paul > I included "URIs that it can ... act on", because it's possible that a > UA could receive an http: URI but be unable to fetch its contents, or > be unable to decode the fetched contents. > > Of course, sentence 2 allows a lot of latitude for implementations, > because it says "interpreted as prescribed by local policy", but I > think it gives the right effect, because, e.g., I don't think anyone > is willing to say "local policy is that if we can't process a URI, we > will just generate white noise". > > In sentence 3, I removed "explicitly" because a number of the listed > factors that "instruct" the UA not to alert aren't really "explicit". > > And I found another cause not to alert: re-INVITEs. But I didn't add > it to the list, because we already list 5 factors. Presumably the > implementors will understand that. > > However, I think that the fact that we've found another factor shows > that we want this requirement to be a SHOULD. As it says in RFC 2119: > > 3. SHOULD This word, or the adjective "RECOMMENDED", mean that there > may exist valid reasons in particular circumstances to ignore a > particular item, but the full implications must be understood and > carefully weighed before choosing a different course. > > Dale > > _______________________________________________ > salud mailing list > salud@ietf.org > https://www.ietf.org/mailman/listinfo/salud >
- Re: [salud] Gen-art LC review of draft-ietf-salud… Dale R. Worley
- Re: [salud] Gen-art LC review of draft-ietf-salud… DRAGE, Keith (Keith)
- Re: [salud] Gen-art LC review of draft-ietf-salud… Dale R. Worley
- [salud] Section 13 (was: Gen-art LC review of dra… Dale R. Worley
- Re: [salud] Section 13 Paul Kyzivat
- Re: [salud] Gen-art LC review of draft-ietf-salud… Dale R. Worley