constructing a decoding order constraint file associated with the picture, wherein the decoding order constraint file includes a reorder indication indicating whether the one or more tiles are able to be reordered without affecting decodability for the one or more tiles. 16. A method comprising : receiving or encoding a bitstream comprising a coded picture, the coded picture comprising one or more tiles; identifying one or more dependent tiles from the one or more tiles, wherein the one or more dependent tiles are dependent on another dependent tile within a coded picture or form a logical atomic unit with another dependent tile; constructing an indication of an in-picture-prediction-enabled tile set comprising the one or more dependent tiles; and causing storage of the bitstream and the indication of the in-picture-prediction-enabled tile set. 17. A method according to Claim 16 further comprising: encoding the indication of the in-picture-prediction-enabled tile set in one or more of: a sequence parameter set associated with the bitstream, a picture parameter set associated with the bitstream, or a supplemental enhancement information message associated with the bitstream. 18. A method according to Claim 17 wherein the indication indicates whether the in-picture-prediction-enabled tile set is a temporal motion-constrained tile set. 19. A method according to any of Claims 17 to 18 wherein the indication comprises a dependency forest or graph that indicates a set of prediction dependencies for one or more tiles that are not other non-in-picture predicted tiles to one or more tiles of the in- picture-prediction-enabled tile set. 20. A method according to any of Claims 17 to 19, wherein the indication comprises a set of anchor positions for a set of intra block copy motion vectors of a set of dependent tiles in the in-picture-prediction-enabled tile set.