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Nowadays with the rapid development of information technology and the growth of network bandwidth, application for broadband contains more and more multimedia data such as audio, image, video, etc. An important issue emerges. That is, how to provide multimedia data that can be conveniently saved/loaded, and flexibly operated.Currently, the common multimedia document models have obvious defects: They cannot fully express these media data’ s features, and thus debased the performance of multimedia data application. They only fulfill the basic requirements of multimedia documents; they cannot provide sufficient modeling support for advanced requirements. With the growing application of multimedia documents in network, the referenced disadvantages depress the application and progress of multimedia documents.The thesis is based on the above. The author provides a better multimedia document model and designs the prototype of the model through the research on advantages and disadvantages of existing models and requirements from users.The structure of the thesis as follows:At first, the author researchs on the requirements and characteristics of multimedia document, and analyzes advantages and disadvantages of the existing models. Then, the author designs MDM that is a multimedia document model for broadband application, introducing its feasibility and putting forward its formal specification and advantages. MDM is hierarchical with content layer, logical layer, represent layer and semantic layer. Then, the author analyzes the key technology of implementation, and designs a prototype, and then completes the main functionalities. According to the prototype we testify its feasibility, maturity and other advantages of MDM.The main contribution of this thesis can be concluded as follows:1.Aming at the lack of semantic description of multimedia documents, the thesis puts forward an improved way to dafine them.2.According to the requirements and characteristics of multimedia document, comparing advantages and disadvantages of the existing models, the author designs MDM that is a multimedia document model for broadband application, and puts forward its formal specification and basic manipulation and features.3.Based on MDM, the author analyzes the key technologies of implementation and completes its prototype. The prototype is used in the project of "Network Multimedia Information Management Platform" , testifying its feasibility and validity.
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