Re: [Ltru] Re: script tag for IPA

["Mark Davis" <mark.davis at icu-project.org>]

I generally agree with Addison's comments. A couple of further items.

1. Procedurally, the possibility of getting an IPA script variant is not zero. It was proposed, there was very little discussion, and dismissed without a lot of discussion (I'm just an observer). So if a more reasoned document is presented there could be different results. Unlike other cases, it is not up to one person capriciousness.

2. I think the private use codes (for script, etc) are misunderstood. If an authority designates a code as private use code, that means that it is recognized as a valid code, but 

that authority doesn't attach a meaning to it, and never will.

It does not mean that nobody else can attach a meaning to it -- if that were the case it would be completely pointless to have private use codes. For example, the Unicode Consortium defines a meaning for Qaai (
http://www.unicode.org/reports/tr24/). Any application conformant to the Unicode Standard must interpret Qaai as applied with that meaning. It also attaches meaning to certain private use tags in CLDR (LDML), notably for some region codes:

QO	Outlying Oceania
QU	European Union
ZZ	Unknown or Invalid Territory

But it only takes part of the range: "The private use codes from XA..XZ will never be used by CLDR, and are 
		thus safe for use for other purposes by applications using CLDR data".

It would be possible for RFC4646bis to define a range of private use codes that it will use. This would need to be very carefully done, and we might decide that it is not appropriate, but it is certainly a possibility.

Mark

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