graphviz dot subgraph example

subgraph.dot

digraph
{
    subgraph cluster_solution
    {
        label="solution"
        App;
        foo;
        baz;
    }
    App -> foo;
    foo -> baz;
    foo -> bar;

    baz -> bar;
    baz -> basebaz;

    subgraph cluster_basebar
    {
        label="basebar"
        trunk;
        trunk51;
    }
    bar-> trunk;
    basebaz->trunk51;
}