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（769862113）Gets or sets the column to which the node is assigned. The default value is -1.
Gets or sets the connected component to which the node is assigned. The default value is NaN.
Gets or sets the index to which the node is assigned. The default value is -1.
Gets or sets the layer to which the node is assigned. The default value is -1.
Gets or sets another LayeredDigraphVertex in the same layer that this node should be near. The default value is null.
（769862113）
This holds LayeredDigraphLayout-specific information about Nodes.
This class inherits from LayoutVertex.