RDF
Before the lab
Lab instructions 2
semantic vocabularies
Predefined properties for describing some domain are called semantic vocabularies.
Have a look at
rdf_dublin for describing documents.
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SPARQL
Reading
Basics
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Run
Twinkle (
on charon: type twinkle
in a terminal) and execute queries on your foaf file to retrieve :
friends who have name and e-mail defined
friends who have name and e-mail defined and optional homepage
friends who have name and e-mail defined and optional homepage, sorted by name descending
friends whose name starts with 'K'
friends who are older than 18 years old
friends whose name starts with 'K' or are older than 18 years old, make search caseinsensitive
friends having e-mails on student.agh.edu.pl server
name of friends, who have homepage or e-mail on student.agh.edu.pl server
DBpedia
Analyze and run example queries from
here
Ask DbPedia about:
Universites in Krakow
Polish football players
Komentarze
Z braku lepszego miejsca tutaj studenci wpisują komentarze natury ogólnej do tego lab.