#LD4L::FoafRDF

LD4L FOAF RDF provides tools for modeling person triples based on the FOAF ontology and persisting to a triplestore.

Installation

Temporary get the gem from github until the gem is released publicly.

Add this line to your application's Gemfile:

gem 'ld4l-foaf_rdf'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install ld4l-foaf_rdf

Primary Dependencies

• ActiveTriples 0.10.0
• RDF 2.0.2

Usage

Caveat: This gem is part of the LD4L Project and is being used in that context. There is no guarantee that the code will work in a usable way outside of its use in LD4L Use Cases.

Examples

Setup required for all examples.

require 'ld4l/foaf_rdf'

# create an in-memory repository
ActiveTriples::Repositories.add_repository :default, RDF::Repository.new

Example creating a person.

p = LD4L::FoafRDF::Person.new('p4')

puts p.dump :ttl

Example triples created for a person.

<http://localhost/p4> a <http://xmlns.com/foaf/0.1/Person> .

Configurations

• base_uri - base URI used when new resources are created (default="http://localhost/")
• localname_minter - minter function to use for creating unique local names (default=nil which uses default minter in active_triples-local_name gem)

Setup for all examples.

• Restart your interactive session (e.g. irb, pry).
• Use the Setup for all examples in main Examples section above.

Example usage using configured base_uri and default localname_minter.

LD4L::FoafRDF.configure do |config|
  config.base_uri = "http://example.org/"
end

p = LD4L::FoafRDF::Person.new(ActiveTriples::LocalName::Minter.generate_local_name(
              LD4L::FoafRDF::Person, 10, {:prefix=>'p'} ))

puts p.dump :ttl

NOTE: If base_uri is not used, you need to restart your interactive environment (e.g. irb, pry). Once the Person class is instantiated the first time, the base_uri for the class is set. If you ran through the main Examples, the base_uri was set to the default base_uri.

Example triples created for a person with configured base_uri and default minter.

<http://example.org/p45c9c85b-25af-4c52-96a4-cf0d8b70a768> a <http://xmlns.com/foaf/0.1/Person> .

Example usage using configured base_uri and configured localname_minter.

LD4L::FoafRDF.configure do |config|
  config.base_uri = "http://example.org/"
  config.localname_minter = lambda { |prefix=""| prefix+'_configured_'+SecureRandom.uuid }
end

p = LD4L::FoafRDF::Person.new(ActiveTriples::LocalName::Minter.generate_local_name(
              LD4L::FoafRDF::Person, 10, 'p',
              &LD4L::FoafRDF.configuration.localname_minter ))

puts p.dump :ttl

NOTE: If base_uri is not used, you need to restart your interactive environment (e.g. irb, pry). Once the Person class is instantiated the first time, the base_uri for the class is set. If you ran through the main Examples, the base_uri was set to the default base_uri.

Example triples created for a person with configured base_uri and configured minter.

<http://example.org/p_configured_6498ba05-8b21-4e8c-b9d4-a6d5d2180966> a <http://xmlns.com/foaf/0.1/Person> .

Models

The LD4L::FoafRDF gem provides model definitions using the ActiveTriples framework extension of ruby-rdf/rdf. The following models are provided:

1. LD4L::FoafRDF::Person - Implements the Person class in the FOAF ontology. (extremely simple for holding rdf_subject only)

Ontologies

The listed ontologies are used to represent the primary metadata about the person. Other ontologies may also be used that aren't listed.

• FOAF
• RDF

Contributing

1. Fork it ( https://github.com/[my-github-username]/ld4l-foaf_rdf/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request