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Complexity: ACE Combination
Note that each server may only advertise one of three ace combination models.
DAV:ace-combination
DAV:first-match
DAV:all-grant-before-any-deny
DAV:specific-deny-overrides-grant

Can we map all three of these to one canonical?
Then as long as the server does mapping right, security is improved (only one source of bugs).
PPT Version