Ontology mapping plays a key role in semantic integration area

a top-down ontology mapping method is proposed by this paper

it considering four basic mapping and this mapping process is assumed that all cases are 1:1.This approach describes the ontology as a graph and each ontology concept defined as a tree

on the basis of the tree

give the similarity computation method of leaf nodes and non-leaf nodes

merge the concept sub-tree by concept classification

According to the results of classification re-organization ontology chart structure.Finally

give a complete ontology mapping model.If the number of ontology is greater than two

concept of group separation method will be used

that is

a similar ontology in the same group

no similar in a different group

the separation date until convergence.Experimental results show that the layer classification ontology mapping method can reduce non-related concepts among count for large scale structure ontology mapping for the efficiency and accuracy it achieve the desired results.