metabrainz/musicbrainz-server — pull request #74 by reosarevok (2013-02-02 15:55:58+00:00)
Title: MBS-5434: Inconsistent terminology: primary/secondary types and type/extra types

http://tickets.musicbrainz.org/browse/MBS-5434

Choosing Primary / Secondary since that's what we call them internally and also in documentation: http://wiki.musicbrainz.org/Release_Group/Type