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Re:A syntactic theory of software architecture (1995) [pdf] by nayuki on Monday September 12, 2022 @12:23PM (#32812638)
Re:A syntactic theory of software architecture (1995) [pdf] by dangarbri3 on Monday September 12, 2022 @11:35AM (#32811914)
So PlantUML
Re:A syntactic theory of software architecture (1995) [pdf] by a3w on Tuesday September 13, 2022 @05:28AM (#32822173)
The abridged UML history shown in Wikipedia never mentions these two authors. The scope seems to overlap sometimes, of course.

One proposed graph type reminds me of petri nets.