Schema

The mbrainz-sample schema is an adaptation of a subset of the full MusicBrainz schema. We didn't include some entities, and we made some simplifying assumptions and combined some entities. In particular:

• We omit any notion of Work
• We combine Track, Tracklist and Recording into simply "track"
• We renamed Release group to "abstractRelease"

Abstract Release vs. Release vs. Medium

NOTE: abstractRelease data are omitted from the 1968-1973 subset database.

(Adapted from the MusicBrainz schema docs)

An "abstractRelease" is an abstract "album" entity (e.g. "The Wall" by Pink Floyd). A "release" is something you can buy in your music store (e.g. the 1984 US vinyl release of "The Wall" by Columbia, as opposed to the 2000 US CD release by Capitol Records).

Therefore, when you query for releases e.g. by name, you may see duplicate releases. To find just the "work of art" level album entity, query for abstractRelease.

The media are the physical components comprising a release (disks, CDs, tapes, cartridges, piano rolls). One medium will have several tracks, and the total tracks across all media represent the track list of the release.

Relationship Diagram

Entities

abstractRelease

NOTE: abstractRelease data are omitted from the 1968-1973 subset database.

attribute	type	cardinality
:abstractRelease/name	indexed string	one
:abstractRelease/artistCredit	fulltext string	one
:abstractRelease/gid	uniquely identifying, indexed uuid	one
:abstractRelease/type	enum ref, one of: :release.type/album :release.type/single :release.type/ep :release.type/audiobook :release.type/other	one
:abstractRelease/artists	ref	many

artist

attribute	type	cardinality
:artist/startYear	indexed long	one
:artist/startMonth	long	one
:artist/startDay	long	one
:artist/endYear	long	one
:artist/endMonth	long	one
:artist/endDay	long	one
:artist/sortName	indexed string	one
:artist/name	indexed, fulltext string	one
:artist/gid	uniquely identifying, indexed uuid	one
:artist/country	ref	one
:artist/type	enum ref, one of: :artist.type/person :artist.type/group :artist.type/other	one
:artist/gender	enum ref, one of: :artist.gender/male :artist.gender/female :artist.gender/other	one

country

attribute	type	cardinality
:country/name	unique string	one

label

attribute	type	cardinality
:label/startYear	indexed long	one
:label/startMonth	long	one
:label/startDay	long	one
:label/endYear	long	one
:label/endMonth	long	one
:label/endDay	long	one
:label/sortName	indexed string	one
:label/name	indexed, fulltext string	one
:label/gid	uniquely identifying, indexed uuid	one
:label/country	ref	one
:label/type	enum ref, one of: :label.type/distributor :label.type/holding :label.type/production :label.type/originalProduction :label.type/bootlegProduction :label.type/reissueProduction :label.type/publisher	one

language

attribute	type	cardinality
:language/name	unique string	one

medium

attribute	type	cardinality
:medium/position	long	one
:medium/trackCount	long	one
:medium/format	enum ref, one of: :medium.format/dvdVideo :medium.format/laserDisc :medium.format/cd :medium.format/hddvd :medium.format/vhs :medium.format/svcd :medium.format/dcc :medium.format/cdr :medium.format/slotMusic :medium.format/bluray :medium.format/waxCylinder :medium.format/cartridge :medium.format/umd :medium.format/miniDisc :medium.format/vinyl :medium.format/vinyl12 :medium.format/sacd :medium.format/other :medium.format/dualDisc :medium.format/vinyl10 :medium.format/dvd :medium.format/pianoRoll :medium.format/betamax :medium.format/vcd :medium.format/dat :medium.format/reel :medium.format/vinyl7 :medium.format/dvdAudio :medium.format/digitalMedia :medium.format/hdcd :medium.format/videotape :medium.format/usbFlashDrive :medium.format/cassette :medium.format/cd8cm	one
:medium/tracks	component ref	many

release

attribute	type	cardinality
:release/year	indexed long	one
:release/month	long	one
:release/day	long	one
:release/artistCredit	fulltext string	one
:release/status	indexed string	one
:release/barcode	string	one
:release/name	indexed, fulltext string	one
:release/gid	uniquely identifying, indexed uuid	one
:release/artists	ref	many
:release/abstractRelease	ref	one
:release/language	ref	one
:release/media	component ref	many
:release/packaging	enum ref, one of: :release.packaging/jewelCase :release.packaging/slimJewelCase :release.packaging/digipak :release.packaging/none :release.packaging/keepCase :release.packaging/cardboardPaperSleeve :release.packaging/other	one
:release/script	ref	one
:release/label	ref	one
:release/country	ref	one

script

attribute	type	cardinality
:script/name	unique string	one

track

attribute	type	cardinality
:track/position	long	one
:track/duration	indexed long	one
:track/artistCredit	fulltext string	one
:track/name	indexed, fulltext string	one
:track/artists	ref	many

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