digraph TopLevel {
    compound = true
    bgcolor = lightcyan1
    fontname = Arial
    fontsize = 8
    label = "lib/slave.rb"
    node [
        fontname = Arial,
        fontsize = 8,
        color = black
    ]

    subgraph cluster_1 {
        fontname = Arial
        color = red
        label = "lib/slave.rb"
        Slave [
            fontcolor = black,
            URL = "classes/Slave.html",
            shape = ellipse,
            color = palegoldenrod,
            style = filled,
            label = "Slave"
        ]

    }

}