Every node but a start node gets a trigger input
The rule
Normative: this is the rule
A reserved trigger input port is injected on every node type except a start node type, unless the node type already declares one, and carries display order 100.
Rule identifiers are permanent and are never renumbered. Each implementation publishes its own standing against these rules; this specification does not.spec 1.0-draft · SCH-11 · changed in spec 1.0