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Whoa, Obie Fernandez dropped a potent little bouillon cube on his blog:

 require 'rexml/document'
 include REXML

 class OWL
   def initialize(url)
     XPath.match(Document.new(Net::HTTP.get(URI.parse(url))), "//owl:Class").
     each do |e|
        eval("#{e.attributes['rdf:ID']} = Class.new")
     end
   end
 end

Scared you? Left you powerfully agape? Truthfully, Ruby is such a great gal, though. Anonymous classes on the house, whenever you please. Don’t miss the screenshot to go with it. Our neck of the woods is gonna get overrun by RDF hounds. (Thanks, Obie!)