CHOICE

       Marks the beginning of a CHOICE value expression.

    OF

       Is an optional word used to clarify syntax.

    boolean-expression

       Is a Boolean expression.

    THEN

       Is an optional language element you can use to clarify syntax.

    value

       Is the value returned by DEC DATATRIEVE if the corresponding
       Boolean expression evaluates to true.

    ELSE value-n

       Is the value returned by DEC DATATRIEVE if all the Boolean
       expressions evaluate to false.