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Mark, you could use the RDF::Sesame plugin (http://rdf.rubyforge.org/sesame/ http://rdf.rubyforge.org/sesame/) to interface to Sesame, which does inference for

by arto 17y ago

Mark, you could use the RDF::Sesame plugin (http://rdf.rubyforge.org/sesame/ http://rdf.rubyforge.org/sesame/) to interface to Sesame, which does inference for you. There is also an in-the-works RDFS gem (http://rdfs.rubyforge.org/ http://rdfs.rubyforge.org/) that will provide RDFS++ natively in Ruby for any RDF.rb-compatible graph or repository.