Source Using DDS:

The following items apply to Figure 447.

(7)
The sequence numbers of lines (records) in the source. Comments are treated like any other specification line and are given sequence numbers.

(8)
The source specifications.

(9)
If an error is found during processing of the DDS and can be traced specifically to a source specification, the error message identifier and an asterisk indicating where the error is are printed immediately following the source specification line. An asterisk is also printed under the sequence number to indicate that the line contains an error message.