1. Exploring Linked Data
Roberto García
Lotico Semantic Web Meetup
San Francisco, August 8th 2012
Human-Computer Interaction
Universitat de Lleida
and Data Integration
Spain
Research Group
2. Who
• Associate Professor, Universitat de Lleida, Spain
• Visiting Associate Professor, Standford University
– Stanford HCI Group
• +12 years Semantic Web research
– 1999 MSc Thesis: Knowledge Management using
RDF plus reasoning (SiLRI)
– 2006 PhD Thesis: A Semantic Web approach to DRM
– 2006- Copyright Ontology
– 2007- Lleida HCI Group, Semantic Web User
Interfaces
7. DEMO
http://rhizomik.net/dbpedia/
IA Components. Menus
DBPedia overview…
…but what about 12.334 birds?
8. IA Components. Facets
• Pre-computed list of facets / class or topic
– Ontologies, Thesaurus + instance data
– Facets for all inverse properties
(explicit or implicit)
• Actor actor – Film:
– Actor has facet “is actor of Film”
– Pivoting: switch from faceted view to related
faceted views (keeping filters)
• E.g.: from Birds facets to Places facets
through the “geo” facet
16. DEMO
http://rhizomik.net/linkedmdb/
Conclusions
• Users build queries without SPARQL or
dataset structure knowledge
• Example:
– Who has directed more films in Oceania?
SELECT DISTINCT ?r1 WHERE {
?r1 a movie:Director .
?r2 movie:director ?r1 .
?r2 a movie:Film.
?r2 movie:country ?r3 .
?r3 movie:country_continent ?r3var0
FILTER(str(?r3var0)="Oceania") }
18. Thanks for your attention
Roberto García
http://rhizomik.net/~roberto
roberto.garcia@udl.cat
Human-Computer Interaction
and Data Integration Universitat de Lleida
Research Group
Editor's Notes
Faceted view for Species > Bird Looking for pigeons (Columbidae) in “Mediterranean Countries”… Filter on direct properties like Familia = Columbidae
No “Mediterranean Countries” in Geo facet…
Use the pivot operation to filter Populated Places connected through the Geo facet…
Faceted view for Populated Place, previous filters are kept
Scroll down to the Subject facet, select “Countries of the Mediterranean Sea”
The Countries in the Mediterranean Sea that have Birds in the Columbidae family, pivot back to Bird to get the list of Birds
Showing the Birds in DBPedia part of the Columbidae family and located in Populated Places related with the “Countries of the Mediterranean Sea” topic
