Re: [w3c/manifest] Add members for localization (PR #1101)

@aphillips commented on this pull request.



> @@ -549,13 +534,7 @@ <h3>
           <li>If |json|["lang"] doesn't [=map/exist=] or if |json|["lang"] is
           not a [=string=], return.
           </li>
-          <li>If calling <a data-cite=

Note that the comment is about _matching_ language tags. _Parsing_ language tags is more straightforward.

It's a good idea to check if the tag is what BCP47 calls "well formed". (BCP47 defined two levels of tag conformance. A tag can be grammatically correct ['well formed'] and it can contain only registered subtags with other restrictions ['valid']. Unfortunately, 402 named the "well-formed-checking" thing `IsStructurallyValidLanguageTag`). In general, few specifications require validity checking of the tags, because that requires access to (a copy of) the IANA Language Subtag Registry, but well-formed checking helps users avoid putting invalid strings in.

The canonicalization of language tags is into locale IDs is probably fine. So perhaps put this text back?

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