Position 22 (External Description)

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Free-Form Syntax For data structures, specify the EXT keyword or the EXTNAME keyword as the first keyword. For subfields, use the EXTFLD keyword as the first keyword.
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This position is used to identify a data structure or data-structure subfield as externally described. If a data structure or subfield is not being defined on this specification, then this field must be left blank.
Entry
Explanation for Data Structures
E
Identifies a data structure as externally described: subfield definitions are defined externally. If the EXTNAME keyword is not specified, positions 7-21 must contain the name of the externally described file containing the data structure definition.
Blank
Program described: subfield definitions for this data structure follow this specification.
 
Entry
Explanation for Subfields
E
Identifies a data-structure subfield as externally described. The specification of an externally described subfield is necessary only when keywords such as EXTFLD and INZ are used.
Blank
Program described: the data-structure subfield is defined on this specification line.