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This paper is to define a model of storage represented strictly in XML, this model is based on the structure of the relational model using the types of the model object. The authors suggest then creating their database according to this model by requests SQL3. They thus realize a framework of management and administration of databases XML based on requests object relational SQL3. They analyze at first the mapping since a request SQL towards a structure of a document XML. They shall describe the mapping by using the language XML SCHEMA because the data must be validated in every operation on the database. The database structure, types and tables definitions will be transformed in an equivalent XML SCHEMA which will be used to store the valid XML data.
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