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Enumeration of possible edge directions (OUTGOING, INGOING).
Enumeration of possible edge tips.
Enumeration of element kinds.
Enumeration of possible node connectivities.
Enumeration of possible relative position of 2 nodes in a directed graph.
Enumeration of possible relationships of two elements in a partial order.
Enumeration of possible matching strictness.
Enumeration of possible methods (DEPTH_FIRST or BREADTH_FIRST) used to
traverse a graph.
Enumeration possible orders (PRE_ORDER or POST_ORDER) used to
traverse a graph.
Enumeration of possible node positions in a tree.