A composite multimedia object is comprised of different media components such as structured data, semi-structured text, video, audio and image, and a variety of relationships among these components that reflect the temporal, spatial, fidelity and security constraints that must be adhered to when rendering it. In this paper, we present a manifestation approach in which composite multimedia objects automatically adjust themselves to cater to the users’credentials, and the capabilities of their computer systems. We present a formal model, that is graphical and mathematical in nature, which is capable of describing, visualizing and validating the multimedia object, and identifying the potential conflicts among the constraints. In particular, we propose an enhanced Petri Net model, called multimedia color-time Petri net (MMCTPN), and demonstrate how it lends itself to automatic manifestation of the multimedia object. In addition, we show how our methodology can be implemented using the Synchronized Multimedia Integration Language (SMIL). SMIL, which is an extension of XML, supports specification of synchronization of the multimedia components and facilitates automatic rendering.
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