[mpeg-OTspec] Updated 4th edition working draft available for review

[Peter Constable]

Thanks, John. Given your reply, I think I'll drop the latter part of the last sentence.


Peter

-----Original Message-----
From: John Hudson [mailto:john at tiro.ca] 
Sent: Wednesday, April 12, 2017 12:56 PM
To: Peter Constable <petercon at microsoft.com>
Cc: Martin Hosken <martin_hosken at sil.org>; Levantovsky, Vladimir <Vladimir.Levantovsky at monotype.com>; mpeg-OTspec at yahoogroups.com
Subject: Re: [mpeg-OTspec] Updated 4th edition working draft available for review

Thanks, Peter. That's better in several respects.

Maybe the last sentence could say something like

     Applications should support use of a non-default language system table
     that is associated with 'DFLT' script, although older applications may not
     do so and might retain this behaviour.

I'd like to encourage everyone going forward to handle this in a consistent way, so not imply that this is something to opt out of.

JH


PS. With regard to the note, I wonder if we might be able to actually define recommended behaviour — not in this part of the spec, but somewhere — for handling of script=Common characters in OpenType Layout, so that we can get some kind of predictability? It's an area in which there's incompatibility between shaping engine implementations, which is very frustrating. In general, we'd do better if there were a singe standard for run itemisation.

cf. My IUC39 presentation
https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftiro.com%2FJohn%2FHudson_IUC39_Beyond_Shaping.pdf&data=02%7C01%7Cpetercon%40microsoft.com%7C28a540d3e2b949576f4608d481dde7ed%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636276237459641505&sdata=N6yePP0U%2FB266jw1F03CIy7%2BelT1f3leNYwMgJa7mZw%3D&reserved=0


-- 

John Hudson
Tiro Typeworks Ltd    https://na01.safelinks.protection.outlook.com/?url=www.tiro.com&data=02%7C01%7Cpetercon%40microsoft.com%7C28a540d3e2b949576f4608d481dde7ed%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636276237459641505&sdata=bcRE6dTwJY2i5s%2FDfY6fwqyzcBLWdznNdU4j0GZ9PWE%3D&reserved=0
Salish Sea, BC        tiro at tiro.com

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