How to make recursive nodes?

I'm currently writing a graphs library in Java, and I would like a tool to visualize some graphs.

In my model, Graphs are composed of Nodes and Edges. Every Node have a certain number of Ports (I/O/IO) and Edges link those Ports together. Some special nodes are called GraphNodes and embed a Graph. The Ports of these GraphNodes are mapped to some Ports of the internal Nodes.

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