This article present a kind of Data Mapping techenology based MDA,descript the Mapping Relation conformably and normally based the united discription of Data Model. At the same time on the MetaModel level of Data Dictionary and based Data Dictionary this article analyse the Mapping Relation between heterogeneous Data Models.It define and Formalize the syntax of the Mapping Relation and provide EBNF to discribe the syntax of the Mapping Relation,present the semantic explaination and graphic symbols of modeling elements of Mapping Relation that can be used to visible modeling.Then on the base of the research of Mapping Relation,this article show how to accomplish the Mapping Relation and present a example of application of Mapping Relation.

MDA.kdh

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