pub fn presence_condition(message_type: &str) -> Option<u32>Expand description
The number of a message type’s bare “Wenn vorhanden” condition, if it has one.
The condition is self-referential: its value is whether the element or
group it annotates is present. Soll [166] on a group means “send it if
you have it”, which only the sender knows, so an absent group annotated
with it is never missing. The generated evaluators answer it with True
(“the rule applies wherever it is evaluated”), which is right for a present
element and wrong for an absent one — see AbsentTarget.
The numbers are stable across every format version in
xml-migs-and-ahbs/ (FV2410–FV2610); keyed by ConditionEvaluator::message_type
rather than by evaluator so aliased and regenerated evaluators need no edit.