一种基于XML的同步超媒体文档模型研究与实现

【作者】 丘威；

【导师】 张立臣；

【作者基本信息】 广东工业大学 ， 软件工程， 2004， 硕士

【摘要】 WWW自发展以来，同步超媒体信息的控制始终是一个难题，也是一个研究热点。为了解决网络上的超媒体表现的同步控制、实时传输和计时超链等问题，本文采用超文本技术和多媒体技术相结合的超媒体技术，应用可扩展标记语言这个新技术来描述同步超媒体文档模型，解决了媒体的异种格式的统一描述和文档的开放性；实现了异构系统之间的交互性、可移植性和资源的共享复用；应用同步多媒体集成语言这个新技术来创建该模型的同步超媒体文档，解决了超媒体文档的实时交互、复用和检索。实现了满足超媒体同步控制中的多种通信模式兼容、文档结构开放、实时交互等的性能。 本文首先简要介绍了超媒体技术及其同步机制，阐述了有关超媒体的基本要素，详细描述超媒体文档模型的结构，形式化定义了超媒体文档模型，分析了超媒体文档的结构特性；其次，对超媒体的同步机制进行综述，详细分析了XML技术及其子集SMIL技术，提出基于XML的同步超媒体文档模型并用UML技术建构了该模型的XML课件文档模型，描述了同步超媒体课件文档之间的时间同步关系和空间编排关系；最后，分析了该课件文档模型的结构特性和建模方法，设计并实现了以该课件文档模型为核心的同步超媒体实时教学系统的原型，分析了该系统的通信结构和逻辑结构，描述了该系统的基于XML模式的对象模型，对该系统原形的一个应用实例进行测试。测试的结果表明该系统比传统网络教学系统具有较强的自适应能力，能较好地解决网络中超媒体文档的实时传输的带宽问题和同步控制问题，达到预期的效果。 本文研究并实现了同步超媒体文档模型，它是基于XML的数据模型和建模方法，使构建的同步超媒体文档模型具有算法简单、创作方便、易于实现、网络传输额外开销小和较好的QoS质量，具有相当广阔的应用前景。但是，对超媒体文档的动态建模和对超媒体资源库的实时更新目前还没有取得应用，这将是以后的进一步的研究工作。更多还原

【Abstract】 Since WWW developed, To control synchronized hypermedia information is always a problem, and a research hotspot too. In order to resolve the hypermedia representation synchronized control, real-time transmission and overtime hyperlink etc problem on the network, In this paper adopt the hypertext technology and multimedia technology combine into hypermedia technology, and apply the new technic XML to describe synchronized hypermedia document model,It settled the media heterogeneity format unification description and open of document ; It implemented the heterogeneity system interactive^ transplantable and resource share and resuse; It apply synchronized multimedia integration language establish its synchronized hypermedia document of model, and settled the hypermedia document real-time interactive, resuse and retrive.lt implemented to satisfy the hypermedia in the synchronized control multi-communication mode compatible, document structure open, real-time interactive etc performance.Firstly, we brief introduced hypermedia technology and the synchronized mechanism in this paper, we expatiated respect hypermedia basic factor, particular described hypermedia document model structure, formalization defined hypermedia document model, analyzed hypermedia document structure characteristic; Secondly, we summarized hypermedia synchronized mechanism, particularly analyzed XML thchnique and its subset SMIL technique, We put forward XML-based synchronized hypermedia document model and with the UML technique erected the XML courseware document model, We described synchronized hypermedia courseware document relation of time synchronization and space layout; Finally, we analyzed the courseware document model srucuture and modelingmethod, designed and implemented with the courseware document model for the core into synchronized hypermedia real-time education system prototype, We analyzed the system communiction structure and logic structure, described the system base on the XML schema object model, Tested the system, the result indicated the system more adaptation than the tradition elearning system, preferably settled the hypermedia document real-time transmission bandwidth and synchronized control problem, reached anticipative purpose.We studied and implemented synchronized hypermedia document model in the paper, It is XML-based data model and modeling method, Constructed the synchronized hypermedia document model have algorithm briefnessN produce facility , tend to implementation , little network transmit superfluity overhead and preferably QoS quality, it has quite vastitude application foreground. But it could not design the dynamic modeling for the courseware document and it could take out application for the real-time update and enrich the courseware resource library now. It will be more research work from now on.更多还原