\chapter{Binary trees}
\label{chap-binary-trees}

\Defclass {node}

This class is the base class for all node types in binary trees.

\Defclass {simple-node}

This class is a subclass of the class \texttt{node}.  It does not add
any slots, and is only meant for client code to be able to distinguish
between a node with a parent and a node without one.

\chapter{Binary trees}
\label{chap-binary-trees}

\Defclass {node}

This class is the base class for all node types in binary trees.

\Defclass {simple-node}

This class is a subclass of the class \texttt{node}.  It does not add
any slots, and is only meant for client code to be able to distinguish
between a node with a parent and a node without one.

\Defclass {node-with-parent}

This class is a subclass of the class \texttt{node}.  It adds a slot
for storing a reference to the parent node in a binary tree.

Add description of class NODE-WITH-PARENT.
Add description of class NODE-WITH-PARENT.
