DOT

DOT is a graph description language. There are several programs that can be used to render, view, and manipulate graphs in the DOT language, most notable of which is Graphviz <1>.

Example

The following example illustrates the basic syntax of DOT.

digraph example {
	charset="UTF-8" // default charset

	node [shape=box] // default node style
	newrank="true"   // new ranking algorithm
	rankdir="LR"     // rank direction: TB (default), BT, LR, RL
	compound="true"  // allows edges between clusters with lhead and ltail

	a1 [label="A1"];
	a2 [label="A2"];

	subgraph cluster_b {
		label="A cluster of Bs";
		color=purple;
		rank="same"; /* rank constraints on the nodes in a subgraph:
		                   "same" - all nodes are placed on the same rank
		                   "min" - all nodes are placed on the minimum rank */
		b1 [label="B1", shape=diamond, color=white, style=filled, fillcolor=blue];
		b2 [label="B2", shape=doubleoctagon, color=white, style=filled, fillcolor=red];
		b3 [label="B3", shape=hexagon, color=white, style=filled, fillcolor=green];
		b1 -> {b2 b3} [arrowhead=diamond];
	}

	subgraph cluster_c {
		label="Some structures";
		node [shape=record];
		c1 [label="<f0> left|<f1> middle|<f2> right"];
		c2 [label="<f0> one|<f1> two"];
		c3 [label="X|{a |{b|<important> c|d}| e}| X | Y"];
		c1:f1 -> c2:f0;
		c1:f2 -> c3:important;
	}

	a1 -> b1 [arrowhead=dot, label="1?"];
	a2 -> b2 [arrowhead=inv, label="2?", lhead="cluster_b"];
	b2 -> c1 [arrowhead=vee, ltail="cluster_b", lhead="cluster_c"];

}

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