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w3c / ttml2

Timed Text Markup Language 2 (TTML2)
https://w3c.github.io/ttml2/
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The term "vertical scripts" needs formal definition. #230

Closed dae-kim closed 7 years ago

dae-kim commented 7 years ago

See https://www.w3.org/TR/ttml2/#style-attribute-textOrientation

Take, for example, HALFWIDTH KATAKANA LETTER A (U+FF71). Is this part of a vertical script or horizontal script?

skynavga commented 7 years ago

On Thu, Dec 22, 2016 at 12:20 PM, dae-kim notifications@github.com wrote:

See https://www.w3.org/TR/ttml2/#style-attribute-textOrientation

Take, for example, HALFWIDTH KATAKANA LETTER A (U+FF71). Is this part of a vertical script or horizontal script?

Note to editor: add a normative reference to Unicode Technical Report #50 [1], then make use of vertical orientation properties (U, R, Tu, Tr) as needed to better define tts:textOrientation value semantics. That is, do not define orientation in terms of script category (vertical vs horizontal) membership; rather, define it in terms of 'vo' property values in the context of a vertical WM.

[1] http://unicode.org/reports/tr50/

Regarding U+FF71, its 'vo' property is specified to be 'R' in [2], i.e., "rotated 90 degrees clockwise"

[2] http://www.unicode.org/Public/vertical/revision-17/VerticalOrientation-17.txt

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