Restricted Ontology Similarity

Resources integrated from heterogeneous resources of the Semantic Web are usually transformed to ontologies which based on the same ontology schema and can be used for analysis and data mining.These ontologies are different from each others in the part of instances of classes and properties.A variety of methods can be used for the similarity of these ontologies.Basically they apply pair-wise comparison of entities from each of the ontologies and select the most similar pair.These entities include class,property,instance,data type and so on.However,this task can be restricted in the comparison of instances and relations.A similarity measure is introduced for the similarity of restricted ontologies,which makes use of the specialty of inference in ontology and is a 2-grade ontology similarity technique.Moreover,the 2-grade ontology similarity technique can resolve the problem of circularities in similarity definition.