Unicode includes presentation forms for Arabic, Urdu and Persian letters, but not for letters added for Jawi (Malay written in the Arabic script). Will presentation forms be added for Jawi?
No, they won’t. Arabic presentation forms for isolated, medial, initial, and final positional variants were added to the standard primarily for compatibility with some older, legacy character sets that encoded presentation forms directly. That style of text encoding is not encouraged by the Unicode Standard. Instead, all Arabic text (including Jawi) should be represented using the Arabic letters in the Arabic block (U+0600..U+06FF) or the Arabic Supplement block (U+0750..U+077F). Positional variants of Arabic letters are handled by analyzing context when rendering text. Specific glyphs for each position (isolated, medial, initial, and final—or just isolated and final, depending on the letter) need to be defined properly in the font, of course, but no separate character code is required for that.
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