This class provides a graphical editor specialized for editing
a directed acyclic graph (DAG).
It is automatically invoked whenever you open any file with a
".dag" extension.
A DAG is a Graph that does not have cycles. Support for DAGs is built
into the kernel in the DirectedAcyclicGraph
class.
EditDAG class is derived from the
Graphics class, and therefore
inherits all of its features.
Nodes in the canvas widget can be mouse sensitive. For an example of
DAG, see $TYCHO/doc/tychoClasses.dag
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