bumf and indexes tag
I'm confused on the purpose of the tag on a bumf file.
It looks like a list of the files needed for every title on the disc, but i don't get why such a list should be useful. (By trying i saw that players seem to ignore its content)
Furthermore, the specs say that "A BD-ROM Player MAY use file and title relation list to execute a title based deletion and verification".
The "MAY" is suspicious there, it looks to me that it's just an optional thing, useful for extra checks.
Can anybody please shed some light on this?