Building DBpedia Japanese and Linked Data Cloud in Japanese Fumihiro Kato, Hideaki Takeda, Seiji Koide, Ikki Ohmukai {fumi, takeda, koide, i2k}@nii.ac.jp National Institute of Informatics (NII) Research Organization of Information and Systems (ROIS) Graduate University for Advanced Studies (Sokendai) ked Data in Practice Workshop (LDPW2013) , 30 November, 2013
40
Embed
Building DBpedia Japanese and Linked Data Cloud in Japanese
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Building DBpedia Japanese and Linked Data Cloud in Japanese
Fumihiro Kato, Hideaki Takeda, Seiji Koide, Ikki Ohmukai{fumi, takeda, koide, i2k}@nii.ac.jpNational Institute of Informatics (NII)Research Organization of Information and Systems (ROIS)Graduate University for Advanced Studies (Sokendai)
2013 Linked Data in Practice Workshop (LDPW2013) , 30 November, 2013
Two Driving Forces to push LOD in Japan
• LOD for ACademia (LODAC) Project since 2010– A research project in ROIS and NII– Research on Linked Data for research
• Linked Open Data Initiative Inc., (LODI) since 2012– Non Profit Organization– Promotion of LOD in Japan– Collaboration with various stakeholders• Government, Public sectors, companies
• Members of two forces are mostly overlapped
LODAC Project - connecting academic data -
LODAC SPECIES: Connecting species data by nameSpecimen
DB
Species Info. DB
Taxon Name DBGBIF BioSci.
DB
Research DB
No. of Names : 113118No. of Triples : 14,532,449
Data from Source BIntegrated data
dc:references dc:references
dc:references dc:references
dc:references dc:references
dc:creatordc:creator
crm:P55_has_current_location
crm:P55_has_current_location
crm:P55_has_current_locationdc:creator
Data from Source AWork
Museum
Creator
Minimum Data to identify entitiesRaw Data for entities Raw Data for entitiesLODAC Museum: LOD of data in museums
App. for query expansion
CKAN Japanese: Catalog for Open Data
DBPedia Japanese
LODAC Location: Integration of location information
LODAC Museum
• Integrated database for information on museums in Japan– Data• No. of museums : 114• No. of triples :
40,059,131
• Integration by creator, work and institute• Data publication by RDF• Some applications using the data
Type of Information RDF type No. of items
Collections (total) lodac:Specimen + lodac:Work
ca. 1,770,000
Collections (specimen) lodac:Specimen ca. 1,690,000
Collections (creative and historical work)
lodac:Work ca. 130,000
Creators foaf:Person ca. 8,800
Institutes Foaf:Organization ca. 200,000
Yokohama Art Spot
–Application using museum and local data–Data related to art in
• Data hub for Japanese resources– To promote LOD in Japan– To connect datasets in Japanese
• Two linguistic datasets– DBpedia Japanese– RDFized Japanese WordNet
DBpedia Japanese
• DBpedia i18n project– 14 chapters
• generated from Japanese Wikipedia dump files– DIEF (DBpedia Information Extraction
Framework)– ~80m triples
• Linking to– Japanese WordNet– Japanese Wikipedia Ontology– other DBpedia chapters
• http://ja.dbpedia.org
i18n/l10n efforts
• IRI, IRI, IRI, ...• Configurations for Extractors and Parsers• DBpedia Mappings for each chapter
Extraction process
ref: D. Kontokostas et al. "Internationalization of Linked Data. The case of the Greek DBpedia edition." Journal of Web Semantics: Science, Services and Agents on the World Wide Web, vol. 15, No.3, Sep. 2012, pp.51-61
DBpedia Information Extraction Framework
• Software to extract data from Wikipedia dump– including custom extractors/parsers to apply
language specific configurations• Extractors / Parsers– DisambiguationExtractor– HomepageExtractor– ImageExtractor– PersondataExtractor
– providing either dereference, data dump or SPARQL Endpoint
– including Japanese labels– linking to other datasets in
LOD cloud or JLDC
• Open license is not mandatory
JLDC with LOD cloud criteria
21 → 9
Links to/from Japanese WordNet
links WN nouns DBpedia IRIs
WN to DBpedia
DBpedia to WN
resources 33,017 65,788 1,456,158 50.1% 2.3%
properties 1,245 65,788 16,020 1.9% 7.8%
Ongoing Work
• More Wikipedia entries and infoboxes– Wikipedia Town
• More DBpedia mappings– Mapping Party
• Parsers for Japanese– Japanese Calendar: 慶応 3 年 1 月 2 日 =>
"1868-01-02"^^xsd:date
Summary
• Linked Data in Japan is steadily expanding– Started by the research project– Now extended to various areas
• Creating a local chapter of DBpedia is a key to promote Linked Data in the local language– A hub in the local language– People in any areas can find connections in
DBpedia with their data• Promotion of open license is still in progress