1.
RDFUnit can apply Quality Assessment to DBpedia RML Mappings
DBpedia Mappings Quality Assessment
http://rml.io • http:// rdfunit.aksw.org
Anastasia Dimou1, Dimitris Kontokostas2, Markus Freudenberg2,
Ruben Verborgh1, Jens Lehmann2, Erik Mannens1, Sebastian Hellmann2
…WHERE { ?resource a %%C1%% ; %%P1%% ?p . }
<#Mapping>
rr:subjectMap [ rr:class dbo:MusicGenre ] ;
rr:predicateObjectMap [ rr:predicate dbo:birthPlace ].
el.dbpedia.org/
page/…
dbo:MusicGenre
…
DBpedia is derived from Wikipedia using custom mappings
Domain Violation Test Case for RML mappingsDomain Violation Test Case for RDF dataset
… WHERE { ?resource a dbo:MusicGenre ; dbo:birthPlace ?p. }
… WHERE {
?resource rr:predicateObjectMap ?poMap.
?poMap rr:predicate %%P1%% .
?resource rr:subjectMap ?sMap.
?sMap rr:class %%C1%%)
size time #violations
DBPedia EN 115K 11s 160
DBPedia NL 53K 6s 124
Dbpedia All 511K 32s 1,316
Quality Assessment for DBpedia RML mappings
size time #violations
DBPedia EN 62M 16h 3.2M
DBPedia NL 21M 1.5h 815K
Dbpedia All - - -
Quality Assessment for DBpedia dataset
Same violations appear repeatedly over distinct entities.
The violations are derived from mapping definitions
that specify how the RDF dataset will be generated
2AKSW, University of Leipzig1 Ghent University – imec – IDLab
el.dbpedia.org/
page/Τζαζ
dbo:MusicGenre
dbo:birthPlace el.dbpedia.org/
page/Αμερική
el.dbpedia.org/
page/Post-Rock
dbo:MusicGenre
dbo:birthPlace el.dbpedia.org/page
/Ηνωμένο_Βασίλειο
dbo:birthPlace
{{TemplateMapping
| mapToClass = MusicGenre
| mappings =
{{PropertyMapping
| templateProperty = name
| ontologyProperty = dbo:birthPlace }} }}
DBpedia custom mappings
DBpedia RML Mappings
we translated DBpedia custom mappings to RML mappings
RML mappings are expressed in RDF.
RDFUnit validation framework apply its SPARQL-based
Test Cases to RML as it applies them to RDF datasets.
faster Mappings Quality Assessment, higher quality DBpedia dataset