Writing additional data to dvd-video

[egor duda <deo@corpit.ru>]

Hi!

Is it possible to write some additional data to dvd-video disk beyond 
AUDIO_TS and VIDEO_TS directories? Like this

AUDIO_TS/
VIDEO_TS/
 VIDEO_TS.BUP
 VIDEO_TS.IFO
 VTS_01_0.BUP
 VTS_01_0.IFO
 VTS_01_1.VOB
 VTS_01_2.VOB
EXTRAS/
 PHOTOS/
  PHOTO_01.JPG
  PHOTO_02.JPG
 TEXTS/
  TEXT_01.PDF
  TEXT_02.PDF

I'm sure mkisofs will handle such layout, but wonder if it may cause 
compatibility problems with standalone dvd-video players. Searching at 
google i haven't found any direct references that it's allowed or 
prohibited by standard. Any hints/links?

egor