However, even with such great pool of metadata
standards and solutions like MPEG-7 there is no universal
and extensible solution capable of describing interactionproperties of interactive 3D objects. It is due to the fact
that interactive objects change their state according to
interaction results and interaction context, and new object
parameter values cannot be determined a priori. Existing
metadata solutions where designed to handle noninteractive
resources and are focused on a single state of
the described object. Therefore they cannot be efficiently
used for interaction metadata.