nil_uuid? (UUID)

    # File lib/uuidtools.rb, line 303
      def nil_uuid?
        return false if self.time_low != 0
        return false if self.time_mid != 0
        return false if self.time_hi_and_version != 0
        return false if self.clock_seq_hi_and_reserved != 0
        return false if self.clock_seq_low != 0
        self.nodes.each do |node|
          return false if node != 0
        end
        return true
      end