![BGP Query support
f = "http://greggkellogg.net/github-lod/doap.ttl"
doap = Graph.load(f)
✤ Query with
# using RDF::Query
query = Query.new(
RDF::Query
:person => {
RDF.type => FOAF.Person,
FOAF.name => :name,
FOAF.mbox => :email,
})
query.execute(doap).each do |soln|
puts "name: #{soln.name}, email: #{soln[:email]}"
end; nil
# using Query::Pattern
query = Query.new do
pattern [:project, DOAP.developer, :person]
pattern [:person, FOAF.name, :name]
end
query.execute(doap).each do |soln|
puts "project: #{soln.project} name: #{soln.name}"
end; nil
6 Dec 2012 Ruby SemWeb 9](https://image.slidesharecdn.com/rubysemweb-2011-12-06-111206164903-phpapp01/85/Ruby-semweb-2011-12-06-9-320.jpg)
![SPARQL
require 'sparql' ❖ SPARQL gem
f = "./dumps/github-lod.nt" executes locally
doap = Graph.load(f)
for against
query = SPARQL.parse(%q( RDF::Queryable
PREFIX doap: <http://usefulinc.com/ns/doap#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/> object.
SELECT ?repo ?name
❖ SPARQL::Client
WHERE { gem executes
[ a doap:Project;
doap:name ?repo;
against a remote
doap:developer [ a foaf:Person; repository
foaf:name ?name
]
➡ Best for querying
] large datasets.
}
ORDER BY DESC(?repo)
LIMIT 20
))
query.execute(doap).each do |soln|
puts "project: #{soln.repo} name: #{soln.name}"
end; nil
10](https://image.slidesharecdn.com/rubysemweb-2011-12-06-111206164903-phpapp01/85/Ruby-semweb-2011-12-06-10-320.jpg)
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Uploaded byGregg Kellogg
Ruby semweb 2011-12-06
This document discusses using Linked Open Data and RDF with Ruby. It provides an overview of RDF support in Ruby including libraries for reading, writing, querying, and storing RDF data. It also demonstrates how to perform basic RDF graph manipulation and querying using these libraries. Resources for additional documentation and examples using Ruby for semantic web applications are also mentioned.
