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<p><b>Abstract</b>—This paper describes a unified data model that represents multimedia, timeline, and simulation data utilizing a single set of related data modeling constructs. A uniform model for multimedia types structures image, sound, video, and long text data in a consistent way, giving multimedia schemas and queries a degree of data independence even for these complex data types. Information that possesses an intrinsic temporal element can all be represented using a construct called a stream. Streams can be aggregated into parallel multistreams, thus providing a structure for viewing multiple sets of time-based information. The unified stream construct permits real-time measurements, numerical simulation data, and visualizations of that data to be aggregated and manipulated using the same set of operators. Prototypes based on the model have been implemented for two medical application domains: thoracic oncology and thermal ablation therapy of brain tumors. Sample schemas, queries, and screenshots from these domains are provided. Finally, a set of examples is included for an accompanying visual query language discussed in detail in another document.</p>
Multimedia database management, multimedia data model, timeline, simulation, visual data modeling, multimedia data streams, temporal databases, visual querying, multimedia querying, medical multimedia databases.

J. D. Dionisio and A. F. Cárdenas, "A Unified Data Model for Representing Multimedia, Timeline, and Simulation Data," in IEEE Transactions on Knowledge & Data Engineering, vol. 10, no. , pp. 746-767, 1998.
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