Because image file formats are popular, but the resulting XML is HUGE, we need the ability to store the expected XML output in a file that is compressed, e.g., for file.jpg, file.jpg.xml.gz.

We need an option where we can specify:

<tdml:dfdlInfoset type="file" compression="gz">file.jpg.xml.gz</tdml:infoset>

One can always look at the file conveniently using zcat.