Structured Append information for Data Matrix symbols.
The total number of symbols in the sequence (2 to 16).
The file identification, identical for all symbols of the same sequence.
The two file identification codewords (each 1 to 254) are combined as (fileId1 << 8) | fileId2 to arrive at this number.
(fileId1 << 8) | fileId2
The position of this symbol in the sequence, starting at 1.
Structured Append information for Data Matrix symbols.