| As described in the https://grails.apache.org/docs/latest/guide/theWebLayer.html#commandObjects[Grails documentation], |
| ____ |
| A command object is a class that is used in conjunction with data binding, usually to |
| allow validation of data that may not fit into an existing domain class. *A class is only |
| considered to be a command object when it is used as a parameter of an action.* |
| ____ |
| |
| A domain class *can* be used as a command object. So can non-domain classes defined |
| in other files, or even classes defined in the same file as the controller. |
