_set_default_values

# File lib/rss/maker/feed.rb, line 71
          def _set_default_values(&block)
            keep = {
              :id => id,
              :updated => updated,
            }
            self.id ||= about
            self.updated ||= dc_date
            super(&block)
          ensure
            self.id = keep[:id]
            self.updated = keep[:updated]
          end