ISO/IEC JTC 1/SC 29 N - 情報処理学会

Tags are the names given to tables in the OFF font file. All tag names consist of four characters. Names with less than four letters are allowed if followed by the necessary trailing spaces. All tag names defined within a font (e.g., table names, feature tags, language tags) must be built from printing characters represented by ASCII values 32-126. ................
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