| 摘要: |
| 针对WebGIS通信中面向复杂对象及大容量传输的特点,给出了一个新的基于XML的WebGIS通信协议的设计和实现方法.使用UML工具以面向对象的方法细致分析了WebGIS典型的请求和响应协议,并据此详细说明了使用W3C的xML Schema规范设计WebGIS的通信协议的基本方法.最后结合一个WebGIS应用原型,给出了在WebGIS系统中通过对基于xML的通信协议的打包和解析,完成嵌入的主要流程.该通信协议能够适用于分布式异构平台下多种WebGIS系统架构的空间信息交换. |
| 关键词: xML xML schema WebGIS 验证器 协议 |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant Nos.60030005,60073016,60203002(国家自然科学基金);the National High-Tech Research and Development Plan of China under Grant Nos.2001AA113151,2002AA135330,2002AA134030(国家高技术研究 |
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| Design and Implementation of XML-Based Communication Protocols for WebGIS |
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LIU Xin-Peng,LUO Ying-Wei,WANG Xiao-Lin,XU Zhuo-Qun
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| Abstract: |
| Concerning the features of complex objects and massive data transmission, a new XML-based method to design and implement communication protocols for WebGIS is presented. With the aid of UML, the typical requiring and responding protocols of WebGIS are analyzed through object-oriented concept. Based on object oriented analysis of the protocols, the mechanism of designing communication protocols following W3Cs XML Schema specification is illustrated. Finally, the main flow of embedding the protocols into WebGIS is given by packing and parsing XML-based protocols in a WebGIS application prototype. This kind of protocols can be used in spatial information exchange among heterogeneous WebGIS platforms in distributed environment. |
| Key words: XML XML schema WebGIS validator protocol |
