Approach of Determining Semantic Similarity among Concepts between Different Ontologies

To meet the demand of sharing infomation and service in the distribute network,the paper designs the metadata model based on ontology.The MD3 model systematicly evaluates semantic similarity across different ontologies dispense with integrating different ontologies into a shared ontology.Based on the MD3 model,the not-hierarchical ralations evaluating of concepts from different ontologies is focused on,extended the MD3 model to MD4 model to make the semantic similarity of concepts from different ontologies more comprehensive and precise in theory.