This evening, I gave a talk on using Ruby RDF.rb and assorted gems at the Lotico San Francisco Semantic Meetup. I’ve uploaded slides to Slide Share.

I also showed a simple demo using the GitHub API to create FOAF and DOAP records for accounts and repositories, and to do some simple navigation. The demo is running at, and source is (of course) available on GitHub.

The demo is not intended to be a complete application, but it shows some basic capabilities [Ruby LinkedData][( for generating RDF in a variety of formats from Active Record models (which cache the GitHub API calls). The Web-pages are, of course, marked up with RDFa, and you can use content-negotiation, or append an appropriate extension to the URLs, to retrieve the data in alternative RDF formats.