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Clarify glyph name ranges (2.g.i) #1221

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Sep 9, 2020
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Clarify glyph name ranges (2.g.i) #1221

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Clarify glyph name ranges (2.g.i)
PeterCon Sep 4, 2020
5aa0ac3
Revising description of ranges (2.g.i) per comment
PeterCon Sep 5, 2020
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15 changes: 14 additions & 1 deletion docs/OpenTypeFeatureFileSpecification.md
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Expand Up @@ -686,6 +686,18 @@ in an alternate substitution lookup type rule.
<a name="2.g.i"></a>
#### 2.g.i. Ranges

A glyph range is a notational mechanism in the feature file grammar that makes it
possible to define a class of several glyphs is a concise way. The mechanism makes
use of glyph names that use a contiguous alphabetic sequence A to Z or a to z (or
sub-sequences thereof), or that use contiguous numeric sequences, such as 0 to 9. A
range is specified by referencing starting and ending glyph names, and all of the
glyph names in the implied sequence are included in the class. The glyphs referenced
by these names do not have to be in a contiguous sequence in a font file or sources;
only their names need to be in a contiguous sequence.

If a glyph name within the implied sequence does not correspond to a glyph in the font
file or font sources, it is ignored.

A range of glyphs is denoted by a hyphen:

```fea
Expand All @@ -703,7 +715,8 @@ feature file glyph names. For example:
For CID fonts, the ordering is the CID ordering.

For non-CID fonts, the ordering is independent of the ordering of glyphs in the
font. `<firstGlyph>` and `<lastGlyph>` must be the same length and can differ:
font. `<firstGlyph>` and `<lastGlyph>` must be the same length and can differ only
in one of the following ways:

1. By a single letter from A-Z, either uppercase or lowercase. For example:

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