Difference between revisions of "Relationships"

From MusicBrainz Wiki
(Advanced Relationship Types)
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An advanced relationship is a way to represent all the various inter-relationships between [[MusicBrainz Entity|entities]], as well as relationships from [[MusicBrainz Entity|entities]] to information and resources found outside of the [[MusicBrainz Database|MusicBrainz database]].
For example:
* The song [[track:271051c3-1a4c-4612-8c6e-2a5400e37b56|Rockafella Skank]] by Fatboy Slim includes a sample from the Just Brothers song [[track:0ad2aa31-cf5f-4ef4-93d8-4568d404323b|Sliced Tomato]].
* [[artist:85994c53-062f-462e-95fd-3a521dd1fcd2|Paul Di'Anno]] was a member of [[artist:ca891d65-d9b0-4258-89f7-e6ba29d83767|Iron Maiden]] from 1977 until 1981.
* The Metallica album [[release:5997cf87-5225-4830-9edf-358638a24905.html|St. Anger]] was produced by [[artist:4f0730d0-fd52-4818-8a5d-f3f69ce8f378.html|Bob Rock]] & [[artist:65f4f0c5-ef9e-490c-aee3-909e7ae6b2ab.html|Metallica]].
All of this information is stored in a single table in the database, and there is a single user interface for adding new information. In this way, [[MusicBrainz]] has a fairly simple way to deal with extremely complicated data.
==Getting Started==
There is a tutorial at [[How To Make Relationships]].
==Advanced Relationship Types==
Each relationship entered by a user belongs to one [[Advanced Relationship Type]]. These types define:
* Which entities will be related (artists, albums, tracks, etc)
* What [[Advanced Relationship Attribute]]s go along with the relationship
* The link phrases of the relationships, which describe relationship information in an English sentence.
For example, the relationship type "[[Performer Relationship Type]]" can be used to link an artist (for example, [[artist:618b6900-0618-4f1e-b835-bccb17f84294|Eric Clapton]]) to a track on which they performed (for example, [[track:64d0220a-0587-43c9-b7e3-809e8c06542b.html|Runaway Train]]). The definition of [[Performer Relationship Type]] allows an optional attribute to specify the instrument he played ([[Instrument Relationship Attribute]]), so you can say if he played guitar. The definition also says how to construct an English sentence out of this data, so that the website can display the words "Runaway Train was performed by Eric Clapton".
These [[Advanced Relationship Type]]s are themselves simply entries in another database table. This means that new ones can be defined, old ones deleted, and existing ones modified through a relatively simple user-interface which does not require hacking the database internals. Since this data is much more important than any other individual entries, editing of [[Advanced Relationship Type]]s is limited to selected users, called [[Relationship Editor]]s. There are more relationship editors than developers, and the process of adding a new relationship type is much simpler than adding a new database table, so this is a very fast way to expand and improve the [[MusicBrainz Database]].
[[:Category:Relationship Type|Relationship type]]s includes a list of all of the relationship types currently defined, as well as documentation for each individual relationship type.
Please see [[Advanced Relationship Style]].
==Creating and editing relationships==
The types and attributes of advanced relationships are managed by [[Relationship Editor]]s.  They implement new relationships and changes to existing relationships following the passage of a [[Proposals|proposal]] to do so. 
While there are very few [[Relationship Editor]]s, anyone can propose new relationships or changes to existing relationships, using the [[Proposals|proposal process]].  While most editors are not able to directly edit the types of advanced relationships, it can be useful to know what [[Advanced Relationship Attribute Syntax|advanced relationship attribute syntax]] itself supports, as it will be used to implement any relationship proposal which passes RFV.
Advanced Relationships were first officially proposed [[How Advanced Relationships Works|here]].  [[User:DaveEvans|Dave Evans]] created the database structure to allow relationships, and wrote tools for allowing the user to define a type of relationship.  However, the code for linking two entities together and the UI to manipulate relationships themselves was left undone. 
In November of 2004, [[User:RobertKaye|Robert Kaye]] took over working on the user interface and [[User:DonRedman|Don Redman]] became the [[Proposals|Idea Champion]] for advanced relationships.  The design documents of the time, including the [[Advanced Relationship Type Development|original set of relationship types]], make for interesting reading:  [[Simple Advanced Relationships Interface]] describes the initial development of the UI and model for editing relationships, while [[Fancy Advanced Relationships Interface]] describes some then-future ideas for development of that relationships UI and model.
On April 10, 2005, development was completed, and advanced relationship support was officially added to the database.
[[Category:Advanced Relationships]]

Revision as of 08:32, 7 March 2010