In IBM® ILOG® Dojo Diagrammer, graphs can display subgraphs as
nodes.
Nested layouts use recursive layout.
The following figure shows an example of a nested graph.

Example of a nested graph
A graph that is a node in another graph is called a subgraph. Links that connect nodes of different subgraphs
are called subgraph links. The red links in the figure are intergraph links.