public static Model getTestModel() { if (model == null) { ModelBuilder modelBuilder = ModelBuilder; Animals.registerType(modelBuilder); Animal.registerType(modelBuilder); AnimalReference.registerType(modelBuilder); Bird.registerType(modelBuilder); ChildRelationshipDefinition.registerType(modelBuilder); Description.registerType(modelBuilder); FlightPartnerRef.registerType(modelBuilder); FlyingAnimal.registerType(modelBuilder); Guardian.registerType(modelBuilder); GuardEgg.registerType(modelBuilder); Mother.registerType(modelBuilder); SpouseRef.registerType(modelBuilder); FriendRelationshipDefinition.registerType(modelBuilder); RelationshipDefinition.registerType(modelBuilder); RelationshipDefinitionRef.registerType(modelBuilder); Egg.registerType(modelBuilder); FlightInstructor.registerType(modelBuilder); Wings.registerType(modelBuilder); model = modelBuilder.build(); } return(model); }