CHOICE
CHOICE is a parameter of type TEXT.
The CHOICE parameter presents the user with a descriptive list of choices. In KCM ComposerUI for HTML5 this option sets the help text for the question.
In a KCM Core environment, you can use an EXTRA variable to pass run-time information to a Master Template.
You also use an EXTRA variable during Master Template development to pass dummy data to parts of a Master Template. This gives you the ability to debug parts of the Master Template.