# File lib/yaml/rubytypes.rb, line 229
        def to_yaml( opts = {} )
                YAML::quick_emit( object_id, opts ) do |out|
            # if self.begin.is_complex_yaml? or self.begin.respond_to? :to_str or
            #   self.end.is_complex_yaml? or self.end.respond_to? :to_str or
            #   not to_yaml_properties.empty?
                out.map( taguri, to_yaml_style ) do |map|
                    map.add( 'begin', self.begin )
                    map.add( 'end', self.end )
                    map.add( 'excl', self.exclude_end? )
                    to_yaml_properties.each do |m|
                        map.add( m, instance_variable_get( m ) )
                    end
                end
            # else
            #     out.scalar( taguri ) do |sc|
            #         sc.embed( self.begin )
            #         sc.concat( self.exclude_end? ? "..." : ".." )
            #         sc.embed( self.end )
            #     end
            # end
        end
        end