The ticket arises out of this discussion on TEI-L:
The Guidelines currently have little or no information on how to encode directionality of text (both horizontally and vertically). The implicit recommendation is to use the W3C's Internationalization Tag Set:
which would involve using e.g. @its:dir="rtl" for right-to-left. There is an example showing how to build a TEI schema in the Exemplars:
ITS, however, doesn't handle vertical text layout (as in Japanese, for instance).
The proposal is to add a new section to Languages and Character Sets (CH) that covers:
- Inherent directionality in Unicode codepoints
- Unicode embedding and override codepoints for directionality
- Desirability of making directionality explicit in encoding (ref http://www.w3.org/International/questions/qa-bidi-css-markup\)
- Recommended use of ITS, and explanation of how to create a schema incorporating it
- Possible approaches to vertical orientation using CSS (http://dev.w3.org/csswg/css3-writing-modes/)
- Differentiation between vertical orientation as common in Japanese text and rotated blocks, which can be handled with tei:zone/@rotate.