type: escString, default: ""
edgeURL overrides any URL defined for the edge.
Also, edgeURL is used near the head or tail node unless overridden by headURL or tailURL, respectively.
See limitation.
See also:
Valid on:Note: map, svg only.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/edgeURL/