https://bugzilla.wikimedia.org/show_bug.cgi?id=50911
Web browser: ---
Bug ID: 50911
Summary: Support transitive properties in SPARQL queries
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Unprioritized
Component: WikidataRepo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Mobile Platform: ---
Transitive properties have wide use in Wikidata. Examples include basic
membership properties like instance of (P31), subclass of (P279) and part of
(P361); and genealogical properties like mother and father. The P31 and P279
properties are based on W3C recommendations for representing information in the
Semantic Web -- rdf:type and rdfs:subClassOf.
The ability to draw conclusions from transitive properties is possible with
RDFS query inference engines that implement SPARQL. A list of SPARQL
implementations is available at http://www.w3.org/wiki/SparqlImplementations.
Handling the simple entailments implied by P31 and P279 seems to be a core
feature of querying in the Semantic Web.
http://meta.wikimedia.org/wiki/Wikidata/Technical_proposal#Optional_extensions_to_phase_3
mentions the first optional goal as "Develop and prepare a SPARQL endpoint to
the data". While support for transitive properties presumably (and
understandably) would not be part of Wikidata's initial support for SPARQL, a
bit down the line it would be very helpful to have support for general
transitive properties in Wikidata SPARQL queries, or at least the more limited
and core feature of handling inferred claims for the rdf:type and
rdfs:subClassOf (P31 and P279) properties.
Magnus Manske has also inquired about support for this kind of feature in
http://meta.wikimedia.org/wiki/Talk:Wikidata/Development/Queries. An earlier
version of this feature request is available at
http://www.wikidata.org/wiki/Wikidata:Contact_the_development_team/Archive/2013/04#Transitive_properties_and_SPARQL.
There are important details that would need to be worked out with conflicting
sources and qualifiers, but I'm filing this here so there's a place to track
this feature request at a high level.
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