AXMEDIS is not based only on MPEG-21, AXMEDIS tools for content processing can work with any file (audio, video, images, document, animations, html, smil, mpeg4, oma, mxf, etc.). It can produce also MPEG-21, when an object is an MPEG-21 package it has more information of a single image or document, and as cons lost its identity in terms of simple file format e.g. TIF, GIF, etc.
This identity in effect is not lost internally, and any AXMEDIS player/editor may extract it according to the DRM. The advantages are the possibility of managing all content type in a uniform manner, standard metadata, etc. In addition AXMEDIS players are: