def each(opts={}, &block)
      attribute_definitions.map{|name, attribute| attribute.to_rdf(self, opts)}.each(&block)
    end
def each(opts={}, &block)
      attribute_definitions.map{|name, attribute| attribute.to_rdf(self, opts)}.each(&block)
    end
Depends on RDF::Queryable, SemanticAccessors and SubjectMethods