pure Perl RDF inferencing

 Resource Description Framework (RDF) is a standard model for data
 interchange on the Web.
 .
 RDF::Closure is a pure Perl RDF inference engine designed as an add-in
 for RDF::Trine. It is largely a port of Ivan Herman's Python RDFClosure
 library, though there has been some restructuing, and there are a few
 extras thrown in.