[mpeg-OTspec] RE: font media types [1 Attachment]

[Bob Hallissy]

> - application/font-off -- to be used as a generic font type that 
> identifies a font resource compliant with ISO OFF / OpenType format 
> (identified by .otf extension);
>

a) Does this imply that OFF fonts MUST NOT have .ttf extension? I was 
unaware of that.

b) I would like to re-visit the issue raised earlier (5 April) by Sairus 
Patel regarding the definition of "compliance with ISO OFF". In 
particular, unless ISO 14496-22 specifically prohibits a font from 
including of any sfnt table tags other than those listed within the spec 
(and I don't think it does, but maybe I'm wrong), then one cannot say 
that, for example, a font is not compliant just because it contains AAT 
or Graphite tables.

Now if we want to define "application/font-off" as being constrained to 
OFF fonts that contain only those sfnt table tags as defined in the 
spec, then we can certainly do that -- we just cannot couch that 
constraint simply in terms of "compliance" with the spec. For example, 
we could say something like:

- application/font-off -- to be used as a generic font type that 
identifies a font resource compliant with ISO OFF / OpenType format and 
which contains only sfnt tables documented by the OFF specification

Regards,

Bob Hallissy
SIL International



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