/* vim: set et sw=4 sts=4: */

digraph classes {
    graph [rankdir=BT];
    node [shape=rect, style=filled, fontname=Sans, fontsize=10];
    edge [];

    /* Abstract classes */
    node [color="#9ec6e0", fontcolor="#000000"]
    Device;
    InternalDevice;

    /* Concrete classes */
    node [color="#2980b9", fontcolor="#ffffff"];

    InternalDevice->Device;
    TimeOfDay->InternalDevice;
    PingServer->InternalDevice;
}