def rdf_type(new_rdf_type)
      self._RDF_TYPE = RDF::URI.new(new_rdf_type.to_s)
      field :rdf_type, RDF.type, :multivalued => true, :is_uri => true # things can have more than 1 type and often do
    end
def rdf_type(new_rdf_type)
      self._RDF_TYPE = RDF::URI.new(new_rdf_type.to_s)
      field :rdf_type, RDF.type, :multivalued => true, :is_uri => true # things can have more than 1 type and often do
    end
makes a "field" on this model called rdf_type
 and sets a class level _RDF_TYPE variable with the rdf_type passed in.