Is it possible to have nested node shapes on Graphviz?

Question

Is it possible to have nested shapes on Graphviz?

I would like to have a diamond inside a square, like the image bellow:

Answer 1

I got a solution:

subgraph cluster_1 {
    margin = 1;
    label  = "";
    associative_entity [shape = diamond, height = 1];
}

Answer 2

The Msquare shape might be close enough if your own solution doesn't work well for what you want.