【作者】 王文俊； 刘昕鹏； 张建伟； 罗英伟； 汪小林； 许卓群；

【Author】 WANG Wenjun, LIU Xinpeng, ZHANG Jianwei, LUO Yingwei, WANG Xiaolin and XU Zhuoqun Dept. of Computer Science and Technology, Peking University, Beijing, 100871

【机构】 北京大学计算机科学技术系；

【摘要】 本文首先介绍了集成框架的研究现状,并提出π集成框架。基于XML、Web Service、Ontology等技术的集成框架PAI包括集成总线及Adapter Service、元数据库及集成协调器与供二次开发的API及Web Service工具集,它实现了数据互操作、软件互操作与语义互操作。集成总线是一组面向领域的编码标准与通讯协议;与总线标准不符的老系统和其它相关系统只需编写Adapter Service就能被集成;元数据库是集成框架的核心,管理系统中的所有信息与应用服务,屏蔽信息及服务的分布性与异构性;集成协调器用于数据的更新,元数据的管理;Ontology则用于定义描述领域相关元数据的术语;数据交换格式与通讯协议均用XML定义;所有应用通过SOAP协议实现互操作。这一集成框架实现了大规模空间信息及服务的动态集成,能保护已有投资,并能集成网上丰富的商业Web Service,是一个开放的可扩充的框架。紧接着介绍了π集成框架实现的初步成果,最后介绍了一个应用实例:基于PAI框架的LBS服务。更多还原

【Abstract】 This paper provides some details of the design of PAI (Peking spatial Applications Integrating Infrastructure), which is based on mainstream information technologies such as XML, web service, ontology and metadata. Many utilities are using PAI to integrate a variety of spatial database, systems and business processes. PAI consists of integrated bus, adapter services, metadata database, PAI mediator and PAI Toolkit. PAI Toolkit is composed of a series of API and web services. Integrating Bus is a group of domain-oriented encoding standards and communication protocols; Adapter Service encapsulations are recommended as a good solution to integrate existing applications or systems into “PAI”; metadata database is the key unit of “PAI”, which manages all data and services and shields the heterogeneity and distribution of spatial data and spatial services; PAI mediator is positioned to manage metadata and update spatial data online; the terms used in metadata are defined in OWL, which is an ontology description language; all data and protocols are encoded in XML; one web service can operate other web services using SOAP protocol. Then, the implement details of PAI are discussed. A study case of LBS Service based on PAI is introduced in the end.更多还原