RDF.rb: Linked Data for Ruby

This is a pure-Ruby library for working with Resource Description Framework (RDF) data.

• http://github.com/bendiken/rdf
• http://blog.datagraph.org/2010/03/rdf-for-ruby

Examples

require 'rdf'

Creating an RDF statement

s = RDF::URI.parse("http://rubygems.org/gems/rdf")
p = RDF::DC.creator
o = RDF::URI.parse("http://ar.to/#self")

stmt = RDF::Statement.new(s, p, o)

Using pre-defined RDF vocabularies

include RDF

DC.title      #=> RDF::URI("http://purl.org/dc/terms/title")
FOAF.knows    #=> RDF::URI("http://xmlns.com/foaf/0.1/knows")
RDFS.seeAlso  #=> RDF::URI("http://www.w3.org/2000/01/rdf-schema#seeAlso")
RSS.title     #=> RDF::URI("http://purl.org/rss/1.0/title")
OWL.sameAs    #=> RDF::URI("http://www.w3.org/2002/07/owl#sameAs")
XSD.dateTime  #=> RDF::URI("http://www.w3.org/2001/XMLSchema#dateTime")

Using ad-hoc RDF vocabularies

foaf = RDF::Vocabulary.new("http://xmlns.com/foaf/0.1/")
foaf.knows    #=> RDF::URI("http://xmlns.com/foaf/0.1/knows")
foaf[:name]   #=> RDF::URI("http://xmlns.com/foaf/0.1/name")
foaf['mbox']  #=> RDF::URI("http://xmlns.com/foaf/0.1/mbox")

Reading N-Triples data

RDF::NTriples::Reader.open("spec/data/test.nt") do |reader|
  reader.each_statement do |statement|
    puts statement.inspect
  end
end

Documentation

• http://rdf.rubyforge.org/

RDF Object Model

• {RDF::Graph}
• {RDF::Literal}
• {RDF::Node}
• {RDF::Resource}
• {RDF::Statement}
• {RDF::URI}
• {RDF::Value}

RDF Serialization

• {RDF::Format}
• {RDF::Reader}
• {RDF::Writer}

RDF Serialization Formats

• {RDF::NTriples}
• RDF::JSON (plugin)
• RDF::Trix (plugin)

RDF Storage

• {RDF::Repository}
• RDF::Sesame (plugin)

RDF Querying

• {RDF::Query}
  • {RDF::Query::Pattern}
  • {RDF::Query::Solution}
  • {RDF::Query::Variable}

RDF Vocabularies

• {RDF::CC} - Creative Commons (CC)
• {RDF::DC} - Dublin Core (DC)
• {RDF::DOAP} - Description of a Project (DOAP)
• {RDF::EXIF} - Exchangeable Image File Format (EXIF)
• {RDF::FOAF} - Friend of a Friend (FOAF)
• {RDF::HTTP} - Hypertext Transfer Protocol (HTTP)
• {RDF::OWL} - Web Ontology Language (OWL)
• {RDF::RDFS} - RDF Schema (RDFS)
• {RDF::RSS} - RDF Site Summary (RSS)
• {RDF::SIOC} - Semantically-Interlinked Online Communities (SIOC)
• {RDF::SKOS} - Simple Knowledge Organization System (SKOS)
• {RDF::WOT} - Web of Trust (WOT)
• {RDF::XHTML} - Extensible HyperText Markup Language (XHTML)
• {RDF::XSD} - XML Schema (XSD)

Dependencies

• Addressable (>= 2.1.1)

Installation

The recommended installation method is via RubyGems. To install the latest official release from RubyGems, do:

% [sudo] gem install rdf

Download

To get a local working copy of the development repository, do:

% git clone git://github.com/bendiken/rdf.git

Alternatively, you can download the latest development version as a tarball as follows:

% wget http://github.com/bendiken/rdf/tarball/master

Resources

• http://rdf.rubyforge.org/
• http://github.com/bendiken/rdf
• http://rubygems.org/gems/rdf
• http://rubyforge.org/projects/rdf/
• http://raa.ruby-lang.org/project/rdf/
• http://www.ohloh.net/p/rdf

See Also

• DataMapper RDF.rb Adapter
• RDFS.rb
• RDFize
• RDFbus
• RDFcache
• Trinity

Author

• Arto Bendiken - http://ar.to/
• Ben Lavender - http://bhuga.net/

License

RDF.rb is free and unencumbered public domain software. For more information, see http://unlicense.org/ or the accompanying UNLICENSE file.