语义Web服务框架模型研究

Research on model of semantic Web service framework

Web服务发现只采用基于关键词匹配的方法查找服务,未能按用户的要求细致地描述服务,这样查找到的服务很难达到优化的目的。为此,提出了语义Web服务框架模型。通过对Web服务添加丰富的语义描述,将用户的要求按约束的形式形成服务模板;然后,将服务模板与统一描述、发现和集成协议中的服务进行基于服务领域、数据语义和功能语义的相似性匹配,从而形成候选服务集合;最后,按用户的约束条件(用服务质量语义表示)从该集合中找到最佳服务。试验证明,该模型在很大程度上提高了Web服务处理的精准度和效能,同时将以往能否找到合适的Web服务的问题提升为怎样选择最佳Web服务的问题。

Web service conducts the research only based on key words matching and this method can＇t accurately describe the services according to the user＇s requirements. Thus, it is difficult to ensure the already-found services to be optimal. In order to deal with this problem, model of semantic,Web service framework was proposed. Firstly the requests from users were represented as Service Template （ST） in forms of constraint by adding enriched semantic description to Web services. After that based on service domain, data semantics and functional semantics, similarity matching between ST and Service Advertisements （SA） was conducted so as to form a set of candidate services. Finally, an optimal service could be found in this set according to user＇s constraints （represented with QoS semantics）. Our experiments have proved that this model could greatly improve the precision and efficiency of Web services. At the same time, it has upgraded the problem from whether suitable services could be found to how to select an optimal one.