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[Ltru] * in extended filtering

Peter Constable <petercon@microsoft.com> Tue, 19 June 2007 17:53 UTC

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From: Peter Constable <petercon@microsoft.com>
To: LTRU Working Group <ltru@ietf.org>
Date: Tue, 19 Jun 2007 10:53:42 -0700
Thread-Topic: * in extended filtering
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Subject: [Ltru] * in extended filtering
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Can someone explain this statement in 3.3.2 (Extended Filtering) of RFC 4647:

"This is the reason why a wildcard in the extended language range is significant in the first position but is ignored in all other positions."

I don't see how "*" is said to be ignored in non-initial position of a range. Step 1 says, "Two subtags match if either they are the same when compared case-insensitively or the language range's subtag is the wildcard '*'." Steps 2 and 3 refer to subtags "match[ing]", where "match" is defined in step 1, and these steps apply only to non-initial positions. Step 3.A also makes explicit reference to "*" in the range subtag -- again, this being non-initial subtags.

I can't figure that sentence out.


Thanks
Peter


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