Abstract: One method of organizing and discovering services is presented under multi-ontology circumstance.When Web services are published，services are organized according to the ontology，namely that services are grouped by computing the similarity between the service description and the concept group of an ontology.Web service discovery needn’t match the service request with all the registered services orderly or one by one.Firstly，service discovery space is reduced based on the service domain of the request；then the space is minished ulteriorly according to the similarity between the service description and the concept group of an ontology to improve the efficiency of service discovery.Moreover，the threshold value ξ of the similarity between the service description and the concept group is set to guarantee the recall；when the finding space is certain，Web services are selected with functional matching and QoS in order to enhance the precision.

Key words: multi-ontology circumstance, service grouping, service discovery, concept group

摘要： 提出一种多本体环境下的服务组织和发现方法。服务注册时，根据服务本体合理组织服务，即计算服务描述与本体概念组间的相似度，对注册服务进行分组。服务发现时，不需要将服务请求与所有注册的服务顺序地、一个一个地进行匹配判断。它首先根据服务请求的服务领域，缩小服务查找空间，然后根据服务请求概念集与本体概念组之间的相似度，进一步减小服务查找空间，进而提高了服务的发现效率。同时设定服务请求概念集与本体概念组之间的相似度阀值ξ的大小，来保证服务的查全率；而服务查找空间确定后，按照服务功能参数匹配筛选满足服务请求功能需求的服务，最后参考服务质量进行选择服务，提高服务查准率。

关键词: 多本体环境, 服务分组, 服务发现, 概念组