type: string, default: ""
If ordering="out", then the outedges of a node, that is, edges with the node as its tail node, must appear left-to-right in the same order in which they are defined in the input.
If ordering="in", then the inedges of a node must appear left-to-right in the same order in which they are defined in the input.
If defined as a graph or subgraph attribute, the value is applied to all nodes in the graph or subgraph.
Note that the graph attribute takes precedence over the node attribute.
Valid on:Note: dot only.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/ordering/