Adapting spatial constraints of composite multimedia objects to achieve universal access

A composite multimedia object (cmo) is comprised of different media components such as text, video, audio and image, with a variety of constraints that must be adhered to. The constraints are 1) rendering constraints that comprise the temporal and spatial constraints between different components, and 2) behavioral constraints that include the security and fidelity constraints on each component. Different users have different 3Cs, which are: capabilities (e.g., monitor size), characteristics (e.g., age) and credentials (e.g., subscription to service). The focus of this paper is on addressing the problems of (1) specifying a consistent cmo that "automatically" adapts its spatial constraints to different user\´s devices. (2) Identifying the conflicts that might occur between the temporal and spatial constraints when having different monitor resolution that displays the cmo by means of reachability analysis of colored time Petri net (3) Resolving the identified conflicts automatically to render a cmo that is error-free when rendered at different user devices.