"type","value"
strict              , "no"
digraph             , "yes"
graph_id            , "graph_21"
open_brace          , "1"
node_id             , "graph"
open_bracket        , "["
attribute_id        , "attribute_21"
equals              , "="
attribute_value     , "value_21"
close_bracket       , "]"
close_brace         , "1"
