The first character must be a letter, and the rest may be letters or digits. The ordering for the description of the parameter field is arbitrary. Datatype identifies the type of information that can be stored in a parameter field. Datatype can be boolean , character , date , integer , long , money , real , string , or time . For a description of these data types, see section 8.6.7.2, Edit Data Type Field .
Size specifies the length in characters of the parameter field on the parameter form.
Omitting this attribute specifies that the parameter variable does not require input.