Research of Mapping XML DTD to Relational Schema

This paper firstly analyzes elements, attributes and operators of XML DTD, then provides the methods of simplifing XML DTD and discusses of the rules and steps of Mapping XML DTD to Relational Schema. These rules not only achieve mapping elements and attributes in XML DTD to tables and fields of relational database, but also build linkage tables between some sub-element and its parent element, between some attributes and their respective elements, so effectively maintain semantic constraints in relational schemas which are from XML DTD. Finally, this paper gives an example of XML DTD and the mapping relational schema to prove the validity of the mapping rules.