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Re: [Justfont] font top-level type: Outlines "in various combinations"

"Levantovsky, Vladimir" <Vladimir.Levantovsky@monotype.com> Mon, 08 February 2016 04:39 UTC

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From: "Levantovsky, Vladimir" <Vladimir.Levantovsky@monotype.com>
To: "justfont@ietf.org" <justfont@ietf.org>
Thread-Topic: [Justfont] font top-level type: Outlines "in various combinations"
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Date: Mon, 08 Feb 2016 04:38:48 +0000
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Subject: Re: [Justfont] font top-level type: Outlines "in various combinations"
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Hi Chris, all,

Although it is unusual to see TTF and CFF outlines present in the same font file, I don't think it is prohibited by the current OFF specification. While the "version" field" only offers a single choice of values for either TTF or CFF outlines having both types be present is a possibility. I'd suggest that we should say that multiple values of the parameter in question can be defined as a comma-separated list of values without imposing any particular restrictions on what these values can be or how different types of outlines can be combined. Whether there is a valid use case to have only SVG outlines present, or if there is (is not) a use case that combines TTF and CFF outlines shouldn't be decided here, I'd rather allow the parameter to reflect what the font data provides.

Thank you,
Vlad


-----Original Message-----
From: Justfont [mailto:justfont-bounces@ietf.org] On Behalf Of Chris Lilley
Sent: Saturday, February 06, 2016 9:03 AM
To: justfont@ietf.org
Subject: [Justfont] font top-level type: Outlines "in various combinations"

Hello,

Open issue #2 concerns this rather wooly phrase:

  TTF, CFF or SVG outlines can be present in various combinations in
  the same font file, therefore, multiple values for the same optional
  parameter may be defined.
  https://github.com/svgeesus/ietf-justfont/issues/2

First, I assume this means multiple values for the parameter, not specifying the parameter multiple times which I have not seen in Internet Media type parameters.

Second, specified how exactly? comma separated list?  space separated?

Thirdly, is this vagueness for forwards compat in case someday CFF and TTF are allowed in the same font file? There are (in OFF v.3) only four valid combinations:

    TTF
    CFF
    TTF, SVG
    CFF, SVG

It seems clearer to say either TTF or CFF, optionally followed by SVG.

Do I need to give a whole grammar along the lines of (wsp? comma wsp*) | wsp+

Alternatively, no commas and just whitespace separated (one or more 0x20). What do people think.

--
Best regards,
 Chris  Lilley
 Technical Director, W3C Interaction Domain

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