Input field in UI

Hi

Is it possible to define constraints on an input field ?
For example, if I want the user to select a value amongst a list of authorized values, how can I do that ? Can we use drop-down lists ?
Other example, if I want the user enter an integer value in a certain range, how can I do that ?

See excerpt from the UPnP specification. I don’t know whether MiOS checks the boundary conditions for input variables that are defined in the service description.