graphviz - How to access nodes edges of dot format graph (Generalised ) in haskell -

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i want access nodes, edges , properties of 'xdotgraph' (g.dotgraph) , set again. here haskell code prints dot format graph using graphviz: 

$ cat example.dot  digraph {      [type1="", type2=""];      b [type1="", type2=""];      -> b [label=""];  }  import data.graphviz import data.text.io t import qualified data.text.lazy b import qualified data.text.lazy.io l import qualified data.graphviz.types.generalised g import data.graphviz.printing  xdottext <- l.readfile "example.xdot" let xdotgraph = parsedotgraph xdottext :: g.dotgraph string t.putstrln $ renderdot $ todot xdotgraph

this works me (mostly identical code there few changes):

#!/usr/bin/env stack {- stack runghc --resolver lts-6.0 --package graphviz  -} import data.graphviz import data.text.io t import qualified data.text.lazy b import qualified data.text.lazy.io l import qualified data.graphviz.types.generalised g import data.graphviz.printing import data.graphviz.types  main =   xdottext <- l.readfile "example.dot"   let xdotgraph = parsedotgraph xdottext :: g.dotgraph string   l.putstrln $ renderdot $ todot xdotgraph   print $ graphnodes xdotgraph   print $ graphedges xdotgraph

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