Lightning Talk about RDF.rb at RejectKaigi2010

1. RDF.rb
Fumihiro Kato /

4. RDF

5. Standardized
Graph Model

6. RDF Store =
Graph DB

7. NoSQL

8. Query SQL SPARQL
DB RDB RDF Store
Model Relational Model RDF(Graph)

9. SPARQL
• The RDF Query Language
• SPARQL Endpoint
• WebAPI

10. SELECT *
WHERE {
?s ?p ?o .
}
LIMIT 10

11. PREFIX dbp-ont: <http://dbpedia.org/ontology/>
PREFIX dbpedia: <http://dbpedia.org/resource/>
SELECT *
WHERE {
?Person dbp-ont:birthPlace dbpedia:Tokyo ;
}
LIMIT 100

12. ActiveRDF
RdfContext
Ruby-sesame
Reddy
Rena
RDFObjects
Semitar RedLeaf
RubyRDF Redland

13. RDF.rb
• Pure Ruby
• UNLICENSE (Public Domain)
• CRuby 1.8.7/1.9.x, JRuby 1.4/1.5
• gem install linkeddata

14. Serialization Formats
• N-Triples
• XML
• Turtle / N3
• JSON
• TRIX
• RDFa

15. Storage Adapter
• Memory
• Sesame
• DataObjects (SQLite3, PostgreSQL)
• RedStore
• 4Store
• MongoDB
• Cassandra
• Talis

16. SPARQL with RDf.rb
require ‘sparql/client’ # gem install sparql-client
sparql = SPARQL::Client(“http://dbpedia.org/sparql”)
# SELECT * WHERE { ?s ?p ?o } LIMIT 10
result = sparql.select.where([:s, :p, :o]).limit(10)
result.each do |solution|
puts solution.inspect
end

17. • http://rdf.rubyforge.org/
• http://github.com/bendiken/rdf
• public-rdf-ruby@w3.org