SVN or Git?
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Fragment of a discussion from Talk:Plural
Perhaps these then: https://gerrit.wikimedia.org/r/gitweb?p=mediawiki/extensions/Translate.git;a=tree;f=data
It's true that CLDR rules are not in our control (projects extract those themselves, usually via i18n framework), but the Gettext rules are authoritative and used like in that file.