DDS concepts

- (1)
- Comments (optional): Comments can appear on any line in DDS.
They are identified by an asterisk in position 7.
- (2)
- File level (optional): File-level keywords appear before the first
record format name (RECORDA on line 00040).
- (3)
- Record level (at least one required): R in position 17 identifies
RECORDA as a record format name. The record level continues until
either the first field is specified or the first help specification.
- (4)
- Help level (optional): H in position 17 identifies the beginning of
a help specification. A help specification continues until the next H
in position 17 or until the first field. Each help specification must
include at least one HLPARA keyword, and a HLPRCD or HLPDOC keyword.
- (5)
- Field level (optional): Display file fields that are passed between
the display device and the program must be named fields and must have a length
specified. Other attributes can be specified explicitly or by
default. Constant (unnamed) fields require only a location and a
keyword, as described in DATE, DFT, TIME, and MSGCON keyword descriptions in
the keyword topic for display files. Positions 17
through 38 do not apply to constant fields.
Notes:
- Items (3) through (5) can be repeated to specify new record
formats within the display file.
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