instance property
Instance is the tracking id this run stamps on everything it manages, so a later run can tell the objects it owns from objects another instance declares. DEPLOY_ENGINE_INSTANCE names it; the default is universe.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? instance;