Rupert Westenthaler created STANBOL-1034:
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Summary: Freebase owl:samAs processor
Key: STANBOL-1034
URL: https://issues.apache.org/jira/browse/STANBOL-1034
Project: Stanbol
Issue Type: Sub-task
Components: Entityhub
Reporter: Rupert Westenthaler
Assignee: Rupert Westenthaler
Freebase does not link any linked data set, but uses Freebase keys to represent
IDs used for an Freebase entity within other data sets. However it does not
support direct links to URIs of Entities in other datasets.
In addition Freebase uses a special encoding for keys [1]. Therefore key values
need
This processor will include support for generating owl:sameAs links to DBPedia
as well as Musicbrainz but may be extended to additional datasets in the future.
DBPedia linking:
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Freebase does not link to DBPedia, but provides links to Wikipedia. But because
DBPedia does use the same local names as Wikipedia this is not a problem.
Freebase provides links to all Wikipedia languages. The mapping will prefer
links to the English language version. Only for Entities where there is no link
to the English version it will consider other language versions.
Freebase often links several Wikipedia pages (of the same language) to a
Freebase entity. Most often those versions are only redirected pages on
Wikipedia. Because of that the linking will try to link only to the main page.
This is determined by taking the name of the Freebase entity; replacing ' '
with '_' and looking if a key for that value exists. If this is not the case
all links are included.
Musicbrainz linking:
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Freebase provides musicbrainz.org IDs as keys. However to provide correct links
based on those IDs one needs to also consider the type of the Entity as
musicbrainz uses the types in for URIS - e.g.
http://musicbrainz.org/recording/71158621-b261-4d3f-8b35-592014dc1fbb
http://musicbrainz.org/release/f3c72169-6a7e-4594-a507-23360652f59c
http://musicbrainz.org/artist/a4d486bd-6020-4a36-9c7d-bf5ce174bcd1
The following mappings between Freebase types (rdf:type) and musicbrainz type
names do exist
recording => http://rdf.freebase.com/ns/music.recording
artist => http://rdf.freebase.com/ns/music.artist
release => http://rdf.freebase.com/ns/music.release
Configuration:
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The configuration will allow to enable/disable the mappings for dbpedia and
freebase
[1] http://wiki.freebase.com/wiki/MQL_key_escaping
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