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A novel model namely Extended Real-Time Synchronization Model (E-RTSM) for modeling SMIL2.0 synchronization behavion is proposed in this paper. E-RTSM deals with schedule-based synchronization as well as event-based synchronization in SMIL2.0. Converting of the temporal relationship of a SMIL2.O document to E-RTSM is presented. Moreover, design of the E-RTSM-based data-retrieving engine for SMIL2.O presentations is also proposed in the paper. The data-retrieving engine estimates the wont-case playback time of each object at the parsing stage and applying an error compensation mechanism at run-time to adjust the estimated playback time as well as the schedule of the fetching request for data retrieval.

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