The trigger's object id from a CancelTarget, parsed from the trigger ref's echo: URI — the key an edge trigger cancel is addressed by. Undefined when there is no trigger or it is not an echo reference (e.g. a type ref).
echo:
The trigger's object id from a CancelTarget, parsed from the trigger ref's
echo:URI — the key an edge trigger cancel is addressed by. Undefined when there is no trigger or it is not an echo reference (e.g. a type ref).