摘要： 针对现有Internet应用在分布式数字图书馆系统中暴露的缺陷，提出了一种新型 的四层结构的Internet应用，并详细分析了该结构中所使用的简单对象访问协议（Simple O bject Access Protocol）。文章最后以数字图书馆的分布式子系统为应用实例，详细描 述 了该系统的组成结构及具体实现，并讨论了系统实现中的错误处理机制、安全机制、数 据表 示和交换格式等关键技术及解决方法。

关键词: 计算机网络, 网络结构, 简单对象访问协议, 可扩展标记语言

Abstract: Aiming at the shortages of the structure of existing Internet applic ation, this paper presents a new four-layer structure and probes in SOAP (simpl e object access protocol). With the distributed sub-system of digital library a s a practical project, the components and implementation of the system are desc rib ed and some key problems and their solutions including error management mech anis m, security mechanism and the format of data expression and exchange are al so di scussed in the end.

中图分类号: 

• TP393.09