W3C home > Mailing lists > Public > public-tt@w3.org > May 2014

Re: Liaison response - template on MIME type parameter for TimedText

From: Glenn Adams <glenn@skynav.com>
Date: Wed, 14 May 2014 13:13:46 -0600
Message-ID: <CACQ=j+faDuAzQdYkp1FAJk1z8agtv6PNQECnrRbMHidGDxkSrw@mail.gmail.com>
To: Nigel Megitt <nigel.megitt@bbc.co.uk>
Cc: David Singer <singer@apple.com>, Cyril Concolato <cyril.concolato@telecom-paristech.fr>, TTWG <public-tt@w3.org>
we will not use this to declare document conformance

On Wednesday, May 14, 2014, Nigel Megitt <nigel.megitt@bbc.co.uk> wrote:

> I don't believe that would help. The choice of interpretation as AND or OR
> depends on whether you're describing a document's conformance or a set of
> processors which could handle the document. The likelihood is that the
> parameter will be misinterpreted whichever we choose, and regardless of how
> clearly we specify the meaning.
>
> I suggest we use a symbol associated with neither AND not OR to highlight
> to anyone about to make an incorrect assumption that they should look up
> what it means and not just guess.
>
> Perhaps # would work as a two-way combinatorial operator?
>
> So when used to express conformance with multiple specifications
> stpp.ttml.abc#def means "conforms to both/all" (the AND relationship) but
> when used to offer a choice of processors it means "any of these processors
> can handle" (the OR relationship).
>
> Any further decisions about the document or processing choice are
> delegated to the implementation and may require parsing a document.
>
> Nigel
>
>
> On 14 May 2014, at 18:52, "David Singer" <singer@apple.com <javascript:;>>
> wrote:
>
> >>
> >> codecs=“stpp.ttml.st10+tt1p”
> >>
> >> or something similar, expressing one TTML track for which either an
> st10 processor or a tt1p processor are acceptable.
> >>
> >> ok; but does anyone but me wonder if '+' is the best operator? in my
> mind it is more associated with AND than OR; could we use '|' instead?
> >
> > My read of the RFCs is that we need to avoid period, comma, and
> double-quote, so vertical bar should be fine.
> >
> >
> > David Singer
> > Manager, Software Standards, Apple Inc.
> >
> >
>
>
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Received on Wednesday, 14 May 2014 19:14:16 UTC

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