Hi,
Assume, inside xmp:subject, we have following keywords:

"one"
"two, three" -such "mistakes" happen
"four"

If I use:
exiftool -xmp:subject image.jpg
-I get/see:
Subject: one, two, three, four

And attempt to delete:
exiftool -xmp:subject-="two" image.jpg
-will, of course, fail (without "obvious" reason).

I guess, you get the point: How can I tell, "two, three" is a single keyword? Is there a possibility I can force exiftool to use another keyword delimiter -so I could get (for example):
Subject: one; two, three; four

Greetings,
Bogdan