public static ModelNode AddOutcomeChoiceField(this ModelNode model, OutcomeChoiceFieldDefinition definition, Action<ModelNode> action)
 {
     return model.AddDefinitionNode(definition, action);
 }
 public static ModelNode AddOutcomeChoiceField(this ModelNode model, OutcomeChoiceFieldDefinition definition)
 {
     return AddOutcomeChoiceField(model, definition, null);
 }