本标准定义了基于客户机/服务器的信息检索服务和协议。它指定了客户端搜索服务器提供的数据库、检索数据库记录以及执行相关信息检索功能的过程和格式。该协议解决了客户端和服务器上的信息检索应用程序之间的通信问题；它不涉及客户端和最终用户之间的交互。本标准描述了信息检索应用服务，并规定了信息检索应用协议。服务定义描述了支持应用程序内功能的服务；这些服务由Z39支持。 50号议定书。协议规范包括协议控制信息的定义、交换该信息的规则，以及实现该协议所需满足的一致性要求。本标准适用于支持信息服务、大学、图书馆和联合编目中心等组织的信息检索服务的系统。它解决了面向连接的程序间通信问题。它没有指定接口。本标准于2015年1月5日转换为稳定维护。

This standard defines a client/server based service and protocol for Information Retrieval. It specifies procedures and formats for a client to search a database provided by a server, retrieve database records, and perform related information retrieval functions. The protocol addresses communication between information retrieval applications at the client and server; it does not address interaction between the client and the end-user.This standard describes the Information Retrieval Application Service and specifies the Information Retrieval Application Protocol. The service definition describes services that support capabilities within an application; the services are in turn supported by the Z39.50 protocol. The protocol specification includes the definition of the protocol control information, the rules for exchanging this information, and the conformance requirements to be met by implementation of this protocol.This standard is intended for systems supporting information retrieval services for organizations such as information services, universities, libraries, and union catalogue centers. It addresses connection oriented, program-to-program communication. It does not specify an interface.This standard was converted to stabilized maintenance January 5, 2015.