Difference between revisions of "LinkedBrainz/NGS to RDF mappings"

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==Advanced Relationships==
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===Advanced Relationships===
 
Currently, only the some of the most basic [[Advanced Relationships]] are modeled.
 
Currently, only the some of the most basic [[Advanced Relationships]] are modeled.
   
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* 'has BBC Music Page at' creates 'owl:sameAs' to BBC Music
 
* 'has BBC Music Page at' creates 'owl:sameAs' to BBC Music
   
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==URIs - Thing v Page ==
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In the Linked Data paradigm, it is important to make a distinction between the ''thing'' and the ''page describing that thing''. Both the ''thing'' and the ''page'' should have their own URI. Think of this simple example to understand why - you might want to say ''"The page about James Brown was created on this date in 1998"'' - if James Brown and the page about James Brown shared the same URI, we would think James Brown was created in 1998 (which is false).
   
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To mitigate this problem we used the [http://www.w3.org/TR/cooluris/#hashuri hash URI] approach. For example the URI for the page about James Brown would be:
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http://musicbrainz.org/artist/20ff3303-4fe2-4a47-a1b6-291e26aa3438
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While the URI for James Brown himself includes a hash suffix simply with an underscore character:
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http://musicbrainz.org/artist/20ff3303-4fe2-4a47-a1b6-291e26aa3438#_
 
[[Category:LinkedBrainz]]
 
[[Category:LinkedBrainz]]

Revision as of 17:28, 17 September 2010

This page is for defining the mapping of Next Generation Schema and Advanced Relationships to RDF. Much of the old content has been moved to the talk page.

NGS at a glance

The following objects exist in the Next Generation Schema. Here we make a clear distinction between core entities which have a unique MBID, entities which share an MBID with some core entity and perhaps other entities, and objects which are not associated with an MBID directly.

core entities that have mbids:

entities that share/borrow mbids:

just objects:

Mappings

The current mapping decisions for mapping NGS to RDF are summarized here. The mappings make use of the Music Ontology and other ontologies. Previous mapping proposals have been moved to the discussion page.

Core

core NGS mappings to RDF
type NGS RDF
core entities

with mbids

'artist' 'mo:MusicArtist' (type=1 => 'mo:SoloMusicArtist', type=2 => 'mo:MusicGroup')
'release' 'mo:Release'
'release_group' 'mo:SignalGroup'
'recording' 'mo:Signal'
'label' 'mo:Label'
'work' 'mo:MusicalWork'
entities

with a URI

(potentially)

'url' 'foaf:Document' or 'owl:sameAs' links to DBpedia etc.
'track' 'mo:Track' as a blank node
'medium' 'mo:Medium' and various 'mfo' concepts
objects

(no URI?)

'tracklist' both a 'mo:Medium' (or mfo subclass) and 'mo:Record'?
'artist_credit' collapse into foaf:maker relations

Advanced Relationships

Currently, only the some of the most basic Advanced Relationships are modeled.

  • 'has a Wikipedia page at' creates 'owl:sameAs' link to corresponding DBpedia resource
  • 'has BBC Music Page at' creates 'owl:sameAs' to BBC Music

URIs - Thing v Page

In the Linked Data paradigm, it is important to make a distinction between the thing and the page describing that thing. Both the thing and the page should have their own URI. Think of this simple example to understand why - you might want to say "The page about James Brown was created on this date in 1998" - if James Brown and the page about James Brown shared the same URI, we would think James Brown was created in 1998 (which is false).

To mitigate this problem we used the hash URI approach. For example the URI for the page about James Brown would be:

  http://musicbrainz.org/artist/20ff3303-4fe2-4a47-a1b6-291e26aa3438

While the URI for James Brown himself includes a hash suffix simply with an underscore character:

  http://musicbrainz.org/artist/20ff3303-4fe2-4a47-a1b6-291e26aa3438#_