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<div>Mathematics already provides an alternative and unambiguous notation for ranges: [a, b] for closed (i.e. includes a and b), and (a, b) for open (does not include a or b). These may be mixed as well: [0, 1000) for instance specifies a value from 0 through
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<div>Maybe it makes sense to adopt something like this?</div>
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<div>Cheers,</div>
<div>Dave</div>
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<span style="font-weight:bold">From: </span><<a href="mailto:mpeg-OTspec@yahoogroups.com">mpeg-OTspec@yahoogroups.com</a>> on behalf of "Peter Constable
<a href="mailto:petercon@microsoft.com">petercon@microsoft.com</a> [mpeg-OTspec]" <<a href="mailto:mpeg-OTspec-noreply@yahoogroups.com">mpeg-OTspec-noreply@yahoogroups.com</a>><br>
<span style="font-weight:bold">Reply-To: </span>Peter Constable <<a href="mailto:petercon@microsoft.com">petercon@microsoft.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, January 5, 2017 at 11:37<br>
<span style="font-weight:bold">To: </span>John Hudson <<a href="mailto:john@tiro.ca">john@tiro.ca</a>>, Indra Kupferschmid <<a href="mailto:kupfers@gmail.com">kupfers@gmail.com</a>>, "<a href="mailto:mpeg-OTspec@yahoogroups.com">mpeg-OTspec@yahoogroups.com</a>"
<<a href="mailto:mpeg-OTspec@yahoogroups.com">mpeg-OTspec@yahoogroups.com</a>><br>
<span style="font-weight:bold">Subject: </span>RE: [mpeg-OTspec] OFF Font variations Working Draft for review<br>
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<p>I looked a bit more into what's actually being done in the OT spec. Interestingly, I discovered that the CFF2 and CFF2 CharString chapters, which Adobe primarily authored, have many instances of en dash surrounded by spaces to indicate a numeric range. These
chapters also have en dashes used as a negation sign (without space between the dash and the number), and as a minus operator — sometimes with and sometimes without spaces.
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In a technical spec like this, the biggest pitfall to avoid would be confusion about numeric range versus negation or subtraction. In some contexts, it may reasonably clear, but using words "from... to..." for numeric ranges, as in OT's wording for OS/2.usWeightClass,
eliminates ambiguity. Words may not be desirable in every context, though. Perhaps that's why the CFF2 authors put spaces before/after en dash when indicating a numeric range.
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Peter <br>
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-----Original Message----- <br>
From: John Hudson [<a href="mailto:john@tiro.ca">mailto:john@tiro.ca</a>] <br>
Sent: Thursday, January 5, 2017 10:24 AM <br>
To: Indra Kupferschmid <<a href="mailto:kupfers@gmail.com">kupfers@gmail.com</a>>; Peter Constable <<a href="mailto:petercon@microsoft.com">petercon@microsoft.com</a>>;
<a href="mailto:mpeg-OTspec@yahoogroups.com">mpeg-OTspec@yahoogroups.com</a> <br>
Subject: Re: [mpeg-OTspec] OFF Font variations Working Draft for review <br>
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On 05/01/17 09:54, Indra Kupferschmid <a href="mailto:kupfers@gmail.com">kupfers@gmail.com</a> [mpeg-OTspec] wrote:
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> Oh disregard, I did not read well enough. I thought you were talking <br>
> about dashes – like this. Ranges, list 0–100 are set with en-dash <br>
> without space. <br>
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Yes. The distinction is between whether the dash is used to separate items or to link them as in a number range.
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JH <br>
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-- <br>
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John Hudson <br>
Tiro Typeworks Ltd www.tiro.com <br>
Salish Sea, BC <a href="mailto:tiro@tiro.com">tiro@tiro.com</a> <br>
<br>
NOTE: In the interests of productivity, I am currently dealing with email on only two days per week, usually Monday and Thursday unless this schedule is disrupted by travel. If you need to contact me urgently, please use some other method of communication.
Thank you. <br>
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