#!/Users/sands/.rvm/rubies/ruby-1.8.7-p371-i386/bin/ruby
require 'rubygems'
require 'rdf'
require 'rdf/ntriples'
include RDF

repository = RDF::Repository.load("http://rdf.rubyforge.org/doap.nt")

# reports correct predicate URI...
#     DOAP.name:  http://usefulinc.com/ns/doap#name
puts "DOAP.name:  #{DOAP.name}"

# reports triple present:  
#     <http://rubygems.org/gems/rdf> <http://usefulinc.com/ns/doap#name> "RDF.rb" .
puts RDF::Writer.for(:ntriples).dump(repository)

# Delete one statement and insert another, atomically:
repository.transaction do |tx|
  subject2 = RDF::URI('http://rubygems.org/gems/rdf')

  tx.delete [subject2, DOAP.documenter, nil]
  tx.insert [subject2, DOAP.name, "RDF.rb 0.3.0"]
end