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The most important class defined by SMILE Wrappers is Network. The objects of this class act as containers for nodes and are responsible for node creation and destruction. Nodes and arcs are always created and destroyed by invoking the methods of the Network class. The access to existing nodes and arcs is always performed through the Network object where they live.

There are no classes representing nodes and arcs. The Network object works as a facade for the complex underlying data structure.