XML Schemas: From Design to Exploitation and Back Again

1. XML Schemas: From Design to Exploitation and Back Again Irena Mlýnková, Martin Nečaský Charles Univeristy in Prague Svratka 2008

2. Overview • Design • Conceptual model • Reverse-engineering • Inference • Similarity • XML-to-relational mapping • Evolution

3. Conceptual Model for XML • 2 levels • based on MDA terminology • MDA = Model-Driven Architecture • PIM (Platform-Independent Model) • Conceptual schema of problem domain • Independent of any particular user view • PSM (Platform-Specific Model) • Schema models specific XML format

4. Conceptual Model for XML

5. Conceptual Model for XML

6. Reverse Engineering • Real-world: • Set of XML schemas representing particular user views • UML/ER diagram exists separately • What we do • We derive mapping semi-automatically • Exploitation of linguistic and structural similarity

7. Inference • Real-world: • Schemaless XML data • What we do: • We infer XML schemas • However, we go far beyond current approaches • Exploitation of more complex XML Schema constructs • Inference based on queries • Exploitation of existing XML schemas

8. Similarity • We measure similarity between two XML schemas • Structure and semantics • Similarity of complex XML schema constructs • Applications • Databases • Data integration

9. XML-to-relational Mapping • Mapping to (object-)relational schema • User-driven strategies with exploitation of similarity of XML schema fragments • Exploitation of conceptual schemas

10. Evolution