网上服务合成系统中的服务描述

Service description in STONE system

为了解决服务合成中的服务描述这一关键问题,提出了一种基于输入输出接口模型和数据流图模型的服务描述方法.用功能对象的概念表示通过网络连接的各种硬件、软件和多媒体资源,通过描述功能对象的输入输出接口来表示用户所需要的资源.采用数据流图来表示所需资源之间的连接.根据以上基于输入输出接口描述和数据流图的模型,提出了基于扩展标记语言(extensiblemarkuplanguage,XML)的服务描述规范,同时介绍了一个生成服务描述文档的客户端软件工具,并已应用于网上服务合成平台STONE(ServicesynThesizerOnNEt)系统中.研究表明,基于输入输出接口描述和数据流图的服务描述方法,是解决网上服务合成中服务描述的有效途径.

In order to resolve the service description problem of service composition, a service description method including mainly a input-output interface model and a data flow diagram model is put forward. By this method, the requested resources called functional objects (FO) including hardware, applications and multimedia resources, which can be accessed through network, are represented according to their input-output interfaces. The connections of requested functional objects are represented in the data flow diagram. Basing on the Input-output interface model and data flow diagram model, a service description criterion in extensible markup language (XML) is presented. A software toolkit to create service description documents automatically is also introduced, which had been used in STONE (Service syn Thesizer On Net, an application platform developed in Tokyo University for ubiquitous computing) system. This research shows that the method based on input-output interface model and data flow diagram model is an effective solution for service description.