at_most_one
INSTANCE at_most_one#1;
extracted_from = {defined_type#25};
choice_set = ?list;
constrainee = explicit_attribute#103;
END_INSTANCE;
INSTANCE at_most_one#2;
extracted_from = {oneof_expression#7};
choice_set = ?set;
constrainee = entity_type#43;
END_INSTANCE;
INSTANCE at_most_one#3;
extracted_from = {defined_type#26};
choice_set = ?set;
constrainee = explicit_attribute#104;
END_INSTANCE;
INSTANCE at_most_one#4;
extracted_from = {defined_type#27};
conjunct_of = conjunction#4;
choice_set = {entity_type#46, entity_type#48};
constrainee = explicit_attribute#122;
END_INSTANCE;