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Unicode planes (was Re: Tahano Nuhicamu font)

From:Philip Newton <philip.newton@...>
Date:Sunday, January 15, 2006, 6:28
On 1/13/06, Paul Bennett <paul-bennett@...> wrote:
> there are > about 65,530 more Planes of 64K codepoints each that are yet to be > defined, and which probably will not be defined any time soon.
No, they *are* defined -- at least, inasmuch as it has been decided that no code point will ever be allocated past U-10FFFF, ever. If I recall correctly, there used to be another huge private-use plane somewhere beyond that point (though no other definitions, even vague ones) in Unicode, but ISO-10646 only defined 17 planes, and when Unicode was brought into step with ISO-10646 they decided to limit themselves to that as well. I suppose in one way, one could say that that means that every representable code point beyond U-10FFFF is free for use (since it'll never be allocated an official meaning), but then you couldn't say you were using Unicode; I don't know, but can imagine that there might be software out there that considers code points beyond U-10FFFF an error, and rightly so, from the point of view of Unicode. -- Philip Newton <philip.newton@...>