Elements are the definitions that define the user interface for an application. Every element is associated with a data type for either input or output. Actors using an application are either sending information
There is one RIDDL definition for each of the four typical categories of User Interface elements1 as shown in the table below
|input of data items to fill an aggregate
|select item(s) from a list
|presents a data value for consideration
|cause the application to change its context
|groups elements together
An Activate definition instructs the application to change context to a different group of elements.