Dear Mr. Peter;
Thanks for the advise, back in 1998 I have developed my inhouse tools
that can Encode OpenType (TrueType Open)  tables to TrueType Fonts
Even in OpenType you need Glyp IDs.
What I want that may fonts should be 100% Unicode Compatable, 
therefore I post question to Unicode.
What I decided now that I will utilize Compatablity Area as much as
possible.
What about the unassinged Code Points Compatabilty Area, I have
Unicode Ver.20, are they assigned to any charachter in Ver 3.x?
Liwal
----- Original Message ----- 
From: <peter_constable@sil.org>
>        
>        In fact, the best option is probably not exactly either:
> 
>        Map the glyph for the isolate from the cmap using the Unicode
>        value in the Arabic block; if you use glyphs that correspond to
>        characters in the compatibility areas (>= U+FB00), then also
>        map these glyphs from the cmap using the Unicode values in that
>        range. For any other glyphs, however, do not map them directly
>        from the cmap; i.e. don't assign them to *any* Unicode value,
>        PUA or otherwise.
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