b-graph.dot

# b-graph.dot
#
# $ dot -Tpng b-graph.dot -o b-graph.png
digraph G {
    Foo0 [shape=record, label="{Foo | Children | Observers}"];
    Bar0 [shape=record, label="{Bar | OhHiMark}"];
    Bar1 [shape=record, label="{Bar | Children}"];
    Baz0 [shape=record, label="{Baz}"];
    Observer0 [shape=record, label="{system}"];
    Foo0 -> Bar0[label="child"];
    Foo0 -> Bar1[label="child"];
    Bar1 -> Baz0[label="child"];
    Foo0 -> Observer0[label="observer"];
}

c-graph.dot

# c-graph.dot
#
# $ dot -Tpng c-graph.dot -o c-graph.png
digraph G {
    Foo0 [shape=record, label="{Foo}"];
    Bar0 [shape=record, label="{Bar | OhHiMark | Children}"];
    Bar1 [shape=record, label="{Bar | Children}"];
    Baz0 [shape=record, label="{Baz | Children}"];
    Observer0 [shape=record, label="{system}"];
    Bar0 -> Foo0[label="child"];
    Bar1 -> Foo0[label="child"];
    Baz0 -> Bar1[label="child"];
    Observer0 -> Foo0[label="observer"];
}