Relationships in model.bim
The default is "many to one".
The "many" is on the "from" side. The "one" is on the "to" side.
If it's one-to-one, then fromCardinality: "one" If it's many-to-many, then toCardinality: "many"
If it's filtering on both, then it's crossFilteringBehavior: "bothDirections"
isActive