ISO/IEC 14496-11:2015 specifies:

1. 1. the coded representation of the spatio-temporal positioning of audio-visual objects as well as their behavior in response to interaction (scene description);
2. 2. the Extensible MPEG-4 Textual (XMT) format, a textual representation of the multimedia content described in ISO/IEC 14496 using the Extensible Markup Language (XML); and
3. 3. a system level description of an application engine (format, delivery, lifecycle, and behavior of downloadable Java byte code applications).