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