"key","value"
edge_id      , '-'
left_brace   , {
attr_name_id , 'color'
colon        , :
attr_value_id, 'cyan'
semi_colon   , ;
right_brace  , }
edge_id      , '-'
left_brace   , {
attr_name_id , 'color'
colon        , :
attr_value_id, 'red'
semi_colon   , ;
right_brace  , }
