ActiveRdfError: cannot execute query without data sources

I am playing around with LinkedData, RDF and SPARQL. That are the basics of the semantic web, the web 3.0. ¬†ActiveRDF is a Ruby Framework for accessing LinkedData in a object oriented way. It is pretty cool. I installed the GEM on my MacBook Air: gem install activerdf And I installed the SPARQL Adapter: gemContinue reading “ActiveRdfError: cannot execute query without data sources”