Every node but a terminal node gets a trigger output
The rule
Normative: this is the rule
A reserved trigger output port is injected on every node type except a terminal 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-12 · changed in spec 1.0