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.