【摘要】 首先简要介绍语义Web服务资源描述框架(RDF4S),在此基础上提出语义Web服务包装机制,语义Web服务经包装后,分别通过组合接口和调用接口为组合语义Web服务的设计与调用提供支持。然后分别详细介绍组合语义Web服务的设计存储和调用执行:通过图形化的设计工具按照语义Web服务的3种基本逻辑关系设计组合结构图,然后将该图映射到组合结构信息表存储,组合语义Web服务执行时根据结构信息表生成语义Web服务代理对象和相应的语义消息,再根据语义消息传递机制调用Web服务实体。最后用一个实例展示组合语义Web服务执行时的消息传递,试验表明该方法有效。更多还原

【Abstract】 With the increment of the resource of Web Services,many effective approaches have been applied in Web Service composition.As few Web Services is with adequate information for Web Service composition and commonly the composition approaches adapt to professional programmers only,a lightweight composition approach based on RDF4S was proposed.The paper first introduced Resources Description Frame-work for Web Service(RDF4S) and the mechanism for packaging Web Service.RDF4S was used to describe the Web Services,and packaging the Web Services accor-ding to RDF4S will supply the Web Service composers and the composition engine with the information for composition.Then a Semantic Web Service composition system based on RDF4S was brought forward.The system consists of a composition designer and a execute engine.The composition designer is a UI tool used by Web Service composers to design the composition structure according to several relation logic rules,and the structure will be stored in a Composition Structure Information Table;the execute engine restores the composition structure from the Composition Structure Information Table,and executes the semantic composed Web services according to the semantic message transport mechanism.Finally,an instance was created for testing the Semantic Web Service composition system,and the results show the approach is effective and flexible.更多还原