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

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