Function define_by_object 

pub fn define_by_object(
    tx: &mut Transaction,
    global_id: &str,
    defining: EntityId,
    defined: &[EntityId],
) -> SpatialAuthoringResult<EntityId>

Stage an IfcRelDefinesByObject: occurrences defined by another object.

Errors

Refuses a malformed GlobalId, an empty object set, and the defining object listed among the objects it defines.