This is a ruby implementation of LDPath, a language for selecting values linked data resources.

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Required gem installation

Add this line to your application's Gemfile:

gem 'ldpath'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ldpath

Additional gem installations

To support RDF serializations, you will need to either install the linkeddata gem which installs a large set of RDF serializations or, in order to have a smaller dependency footprint, install gems for only the serializations your plan to use in your app. The list of serializations are in the README for the linkeddata gem.


require 'ldpath'

my_program = <<-EOF
@prefix dcterms : <http://purl.org/dc/terms/> ;
title = dcterms:title :: xsd:string ;

uri = RDF::URI.new "info:a"

context = RDF::Graph.new << [uri, RDF::Vocab::DC.title, "Some Title"]

program = Ldpath::Program.parse my_program
output = program.evaluate uri, context: context
# => { ... }


  • Ruby 2.5 or the latest 2.4 version is recommended. Later versions may also work.

Product Owner & Maintenance

LDPath is moving toward being a Core Component of the Samvera community. The documentation for what this means can be found here.

Product Owner



The Samvera community is here to help. Please see our support guide.


This software has been developed by and is brought to you by the Samvera community. Learn more at the Samvera website.

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Special thanks to...

Chris Beer for the initial implementation of this gem!