# File lib/puppet/external/dot.rb, line 308
308:         def to_s (t = '')
309:             t + "#{@from} #{edge_link} #{to} [\n" +
310:                 @options.to_a.collect{ |i|
311:                     i[1] && i[0] != 'label' ?
312:                         t + $tab + "#{i[0]} = #{i[1]}" :
313:                         i[1] ? t + $tab + "#{i[0]} = \"#{i[1]}\"" : nil
314:                 }.compact.join( "\n" ) + "\n" + t + "]\n"
315:         end