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+Tree::DAG_Node is a (super)class for representing nodes in a tree.
+
+This class encapsulates/makes/manipulates objects that represent nodes
+in a tree structure. The tree structure is not an object itself, but
+is emergent from the linkages you create between nodes. This class
+provides the methods for making linkages that can be used to build up
+a tree, while preventing you from ever making any kinds of linkages
+which are not allowed in a tree (such as having a node be its own
+mother or ancestor, or having a node have two mothers).