摘要： 阐述了一个基于本体分类的Web服务合成模型，扩展标准的WSDL服务描述，将Web服务及其参数严格映射到本体概念分类层次，使服务描述保存了语义信息，领域本体过滤确保了合成服务的有效性，基于用户的需求描述实现了从现有Web服务中动态发现、匹配和组合服务的功能的算法，根据用户的服务质量要求，模型还能从生成的合成服务链中筛选出最佳服务组合。整个模型在一定程度上实现了服务合成的自动化。

关键词: Web服务, 本体, 服务合成

Abstract: This paper depicts an ontology classification based Web service composition model, which extends the standard specification of WSDL service description to map the service itself and its parameters onto ontology concept hierarchy, and saves the semantic information into service description. Then the model restricts the scope of services which can be used in the composition process by domain ontology filtration, and thus insures the validity of integrated services. Based on users’ requirements, interface match algorithm implements automatic discovery and composition of appropriate Web services. The model can also select the best composite services according to users’ service quality measures. The whole model implements the automatic service composition in some extent.

Key words: Web service, Ontology, Service composition