[mikeandjeny]

Thanks for info, but I hope you are not right about it :-)

I mean am thankful to anyone who contribute to XBMC in any way, especially as I don't have programing skills that are needed, but this does not seem as a comfortable way to do it.

Put every DVD, add it to a library and than XBMC will say - you have to put disc labeled 'TJERRY002_CZ' (which is a label on original Tom&Jerry DVD) in order to play this item?

@cuginosgrizzo : Are you willing to consider different way of achieving offline DVD functionality?

I kind of think this is a good first step. If Volume Label is now stored in the database that gives a good way to identify offline media (be it Disc, USB, removable drive, whatever). Now we should be able to edit that Volume Label. If not now then in the future via the .nfo file, or perhaps one of the standalone media managers.
To use your example...
Tom & Jerry Disc 2 would be added to the library with "TJERRY002_CZ" in the volume label field. You can then edit it to reference Disc number 45(?) in your collection. Then the prompt would say "Insert Disc 45".

For your question of how to add the offline files to the library. The simplest solution is probably to use the script here:
http://forum.xbmc.org/showthread.php?p=2...post243464
Then you can delete the AVI files it creates and edit the .nfo files. At this point (since it is a brand new feature) everything will be manual, but I am sure that later folks will add easier ways to do everything.