RE: [Ltru] Updated draft-4646bis...

In section 4.2:

   Thus a tag such as "ar-Cyrl-CO" (Arabic,
   Cyrillic script, as used in Columbia) is perfectly valid but ought to
   be avoided because it has no relationship with any real language.

I'm reluctant to say anything has *no* relationship with reality and that it "ought" (effectively read SHOULD) be avoided. I'd be happier with something like this:

   Thus a tag such as "ar-Cyrl-CO" (Arabic,
   Cyrillic script, as used in Columbia) is perfectly valid but is not
   likely to be useful as that combination of attributes is unlikely to
   coincide in a real instance of language usage.

Peter

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