graphviz support for subgraphs

Topics: graph
May 5, 2011 at 9:22 PM

does graphviz support subgraphs?

for example :

digraph G {

	subgraph cluster_0 {
		style=filled;
		color=lightgrey;
		node [style=filled,color=white];
		a0 -> a1 -> a2 -> a3;
		label = "process #1";
	}
thanks.