The namelist specifier indicates namelist I/O. It identifies the group-name of the list of entities that can be modified on input or written on output.

The namelist specifier takes the following form:

[NML=]group-name

group-name

Is the name of a list previously defined in a NAMELIST statement.

The keyword NML is optional if the following conditions are true:

• The first parameter is a logical unit specifier without an optional UNIT keyword.

• The namelist specifier is the second parameter in the control list.