DigitalSourceType should be a CV

[blue-j]

IPTC Extension field DigitalSourceType is a CV:

https://cv.iptc.org/newscodes/digitalsourcetype/

but identified as a string here, without the sanctioned choices:

https://exiftool.org/TagNames/XMP.html#iptcExt

- J

[Phil Harvey]

There are many tags like this.  If I make them a closed list it breaks forward compatibility when new choices are (inevitably) added.

There isn't much of an up side to restricting these to the documented strings.

- Phil

[blue-j]

Thanks for letting me know your reasoning on this!  I am implementing a very strict adherence to IPTC schemas and it's been an incredible learning experience, actually reading these specs slowly.

- J

[StarGeek]

The XMP-iptcCore:SubjectCode is even worse, with a very long list.  A quick Find on that page shows over 1,000 entries.  That would be a lot of work to set up with little reward.

[blue-j]

Oh, I'm aware.  Just finished a couple days ago.  :p

-J