.. -*- Mode: rst -*-


9. Advanced Topics
==================

This is a place holder as well as a reminder to myself to write this part of
the documentation.


9.1 Occurrence
~~~~~~~~~~~~~~

The trans-hierarchical workhorse.


9.2 RoutingPads
~~~~~~~~~~~~~~~

Unlike the Plugs_ that only make connections between two **adjacent**
hierarchical levels, RoutingPads_ can refer to a deeply buried terminal.


9.3 HyperNets
~~~~~~~~~~~~~

This class is part of the *virtual flattening* mechanism, it allows to
go through all the components of a trans-hierarchical net.


9.4 Miscellaeous trans-hierarchical functions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

For a starter, how to get all the leaf cells...
