An example graph is shown in Example graph pane below. All
graphs are laid out by the LispWorks IDE, so that their elements
are displayed in an intuitive and easily visible hierarchy. A
graph consists of a number of nodes , linked together by
branches . By default, graphs in the environment are plotted
from left to right: for any given node, the node to which it is
linked on the left is known as its parent , and the nodes to
which it is linked on the right are known as its children . The
originating node of the graph (on the far left) is referred to
as the root node , and the outermost nodes of the graph (towards
the right) are referred to as leaf nodes . The root node does
not have a parent, and leaf nodes do not have any children.
Figure 6.1 Example graph pane You can select nodes in a graph
pane in exactly the same way that you select items in a list.
Selected nodes are highlighted, as shown in Example graph pane.
Similarly, you can copy nodes from a graph onto the clipboard in
a manner consistent with use