Abstract: To implement distributed application component and data storage and access on Internet is a keystone in WebGIS research. Based on the concept of metadata, this paper analyzed the disadvantage of present WebGIS architecture, extended the concept of metadata, brought forward program metadata, and provided a flexible configuration mode of GIS components, preferably solved the problem of sharing distributed data and configuring application flexibly.

Key words: WebGIS, program metadata, component

摘要： 在元数据概念的基础上，分析了目前流行的WebGIS结构模式的不足，拓展了元数据的概念，提出了程序元数据的概念，并基于其上提出了构件灵活配置的应用分布模式，较好的解决了Internet环境下系统应用的灵活配置及分布式数据的共享的问题。

关键词: WebGIS, 程序元数据, 构件