Mapping DTD to Relational Schema: An Approach to Preserving Data Dependency

XML is fast emerging as the standard for representing data in World Wide Web There are many strategies for storing XML documents and using relational database to storage XML is one kind of these strategies In order to store the XML data in relational database, mapping DTD to relational schema is studied An approach to preserving data dependency （PDD） is presented Compared with the shared inlining method, PDD takes full advantage of the data dependencies that are implied in DTD, and guarantees the integrity of XML documents It is based on schema decomposition The resulting relational schemas keep all functional dependencies and satisfy 2NF It is proved to be efficient