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      1 digraph {
      2 	compound=true
      3 	fontname="Inconsolata, Consolas"
      4 	fontsize=10
      5 	margin="0,0"
      6 	ranksep=0.2
      7 	nodesep=0.5
      8 	penwidth=0.5
      9 	colorscheme=spectral7
     10 	
     11 	node [shape=box, fontname="Inconsolata, Consolas", fontsize=10, penwidth=0.5, style=filled, fillcolor=white]
     12 	edge [fontname="Inconsolata, Consolas", fontsize=10, penwidth=0.5]
     13 
     14 	subgraph cluster1 {
     15 		margin="10,10"
     16 		labeljust="left"
     17 		label = "SAX"
     18 		style=filled
     19 		fillcolor=6
     20 
     21 		Reader -> Writer [style=invis]
     22 	}
     23 
     24 	subgraph cluster2 {
     25 		margin="10,10"
     26 		labeljust="left"
     27 		label = "DOM"
     28 		style=filled
     29 		fillcolor=7
     30 
     31 		Value
     32 		Document
     33 	}
     34 
     35 	Handler [label="<<concept>>\nHandler"]
     36 
     37 	{
     38 		edge [arrowtail=onormal, dir=back]
     39 		Value -> Document
     40 		Handler -> Document
     41 		Handler -> Writer
     42 	}
     43 
     44 	{
     45 		edge [arrowhead=vee, style=dashed, constraint=false]
     46 		Reader -> Handler [label="calls"]
     47 		Value -> Handler [label="calls"]
     48 		Document -> Reader [label="uses"]
     49 	}
     50 }