Information Retrieval protocol Z39.50 Application for OPACs

Z39.50是一种信息检索标准，它允许连接到网络的两台计算机系统交换消息，以搜索数据库和接收记录。本标准参照国际标准ISO 23950：“信息检索（Z39.50）：应用服务定义和协议规范”和JIS X0806-1999。Z39.50搜索协议，结合万维网的普及，使得OPAC （Online Public Access catalog，在线公共访问目录）的高度集成和标准化成为可能。本研究是一个利用Z39.50在本地环境下对opac进行无缝搜索的项目。开发了一个程序，允许用户在基于web的搜索会话中查询各种问题，包括用户身份验证，在Z39.50兼容的opac上查询。Z39.50是有状态的和面向连接的。通过一系列检索实验考察了有状态（Z39.50）和无状态（WWW）的差异。

The Z39.50 is a standard for information retrieval that allows two computer systems connected to a network to exchange messages for the purpose of searching databases and receiving records. This standard refers to the International Standard, ISO 23950:"Information Retrieval (Z39.50): Application Service Definition and Protocol Specification", and to JIS X0806-1999. The search protocol Z39.50, in combination with the spread of the World Wide Web makes possible a high degree of integration and standardization of OPAC (Online Public Access catalog). This study is a project which seeks to combine in a seamless searching of OPACs using Z39.50 in local environment. A program was developed which allows the user to query various question from within the Web-based search session and include patron authentication, querying on Z39.50 compatible OPACs. The Z39.50 is stateful and connection-oriented. Some differences between stateful (Z39.50) and stateless (WWW) were examined by A series of retrieval experiments.