There are two instances when a positional parameter is represented by key entries in the text string for a DD statement. When a DD statement specifies DD DYNAM, the DD indicator in the prefix is set to X'08'. When it specifies DD DUMMY, the DD indicator is set to X'01'. In both of these cases, a key entry containing the respective key value and one parameter of length zero is added to the text string.

If a DD statement specifies DD * or DD DATA, the DD indicator in the prefix is set to X'10'. No other key entry is defined in the text string for these positional parameters.