基于OAI PMH协议的WMO信息系统元数据同步功能设计与实现

WMO信息系统(WIS)的一项重要功能是提供与数据存储位置无关的数据发现、访问和检索服务,而实现这一功能的最简便途径之一就是元数据同步。OAI-PMH协议因其简单性、开放性和可操作性,在元数据同步领域得到广泛应用。在简要介绍OAI-PMH协议的基础上,设计了WIS元数据同步功能。WIS元数据同步模块由元数据仓储、元数据提供服务和元数据收割服务组成。详细介绍了元数据仓储的组成,以及元数据提供服务和收割服务的处理流程。采用Java语言实现了WIS元数据同步功能,并进行了详细测试。其中,元数据提供服务分别通过了开源软件JOAI和OAI官方网站的测试;元数据收割服务可成功收割DLESE和德国气候中心提供的元数据。

Design and Realization of Metadata Synchronization Based on OAI MPH for WMO Information System

It is an important function to provide data discovery,access and retrieval service in the WMO Information System（WIS）.In recent years,the OAI-PMH protocol is widely used in data sharing and the metadata synchronization field because of its simplicity,openness and operability.After a brief introduction of the OAI-PMH protocol,the design of the metadata synchronization function of WIS is presented.The design is composed of metadata repository,metadata provider service,and metadata harvester service.Then the work flow of metadata provider and harvester service is discussed in detail.The metadata synchronization function is developed using Java language.The provider service has passed the testing of the open source software OAI（Open Archive Initiative） and JOAI（Java-based OAI） official website,and the harvester service has successfully harvested the metadata of DLESE（Digital Library for Earth System Education） and the Climate Data Center of Deutscher Wetterdienst.