RejectKaigi2010 - RDF.rb

RDF.rb Fumihiro Kato /

Standardized Graph Model

RDF Store = Graph DB

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

SPARQL • The RDF Query Language • SPARQL Endpoint • WebAPI

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

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

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

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

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

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

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

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

RejectKaigi2010 - RDF.rb

by Fumihiro Kato

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