中文摘要：

面向广域分布环境下信息资源共享与服务的需要，设计了基于本体的元数据模型，并在MD3模型的基础上给出了一种基于该元数据模型的跨本体的语义相似度计算方法——MD4模型。MD4充分利用本体对实体的描述信息，重点讨论了实体名称、实体属性、实体语义环境以及实体实例等相似度的计算，把MD3模型扩展到MD4模型，使得信息资源实体间语义相似度的计算更全面、精确。

英文摘要：

Oriented the demand of sharing information and service in the distribute network, this paper designed the metadata model based ontology. The MD3 model systematically evaluated semantic similarity across different ontologies dispense with in- tegrating different ontologies into a shared ontology. Based on the MD3 model, focused on the not-hierarchical relations evaluating of concepts from different ontologies, extended the MD3 model to MD4 model to make the semantic similarity of concepts from different ontologies more comprehensive and precise.