1. 1 MFI-3 Ontology Evolution Metamodel HE Keqing,HE Yangfan 2007,6

2. 2 ISO/IEC 19763-3 MFI Ontology Registration China  He Keqing (Project editor, SKLSE, Wuhan Univ.)  He Yangfan (SKLSE, Wuhan Univ.)  Wang Chong (SKLSE, Wuhan Univ.)  Wang Jian(SKLSE, Wuhan Univ.) Japan  Hajime Horiuchi (Tokyo International Univ.)  Masao Okabe (Project editor, TEPCO)  Masaharu Obayashi (K-three) Korea  Doo-Kwon Baik (Korea Univ.)  Sam Oh (Sungkyunkwan Univ.)

3. 3 Content Background MFI-3 Basic Idea Key concepts and Draft metamodel

4. 4 What is Ontology In computer science,ontology A kind of metamodel Explicitly express the implication of concepts Basis for the communication, knowledge sharing & exchange and interoperation between  People  People and information system  Information systems

5. 5 An Ontology Transitive Attributes Inverse Attributes Relationship between concepts Link between individuals instanceOf

6. 6 Semantic Interoperation semantic web service Semantic tagging tech  Make domain assumptions explicit  A community reference for applications Ontology Management Ontology Registration Ontology Evolution …

7. 7 MFI-3 Ontology Registration

8. 8 Ontology Evolution Reasons Application domains and user ‘ s needs are changing System can be improved … Ontology evolution is the timely adaptation of an ontology and the consistent propagation of the changes to dependent artifacts.

9. 9 Content Background MFI-3 Basic Idea Key concepts and Draft metamodel

10. 10 Scope of MFI Ontology Evolution

11. 11 Key Problems How to registrate ontologies? What kind of change can be identified and described by MFI-3? How to realign the dependent ontologies during the evolution process? How to keep the evolution information about ontologies

12. 12 Our Solution (1/2) How to registrate ontologies? What kind of change can be identified and described by MFI-3? How to realign the dependent ontologies during the evolution process? How to keep the evolution information about ontologies Kernel Model Change Model Constraint Model Change Propagation Model Evolution Information Model

13. 13 Our Solution (2/2)

14. 14 Change Model

15. 15 Requirements for ontology evolution Domain experts We need add class A, remove individual i… Information system engineer We need keep class B, individual i… Possible conflict ! Ontology engineer We need some measures to resolve the conflicts ontology Change Closure Consistency Closure Evolution Strategy Final Change Set Constraint Model (1/9)

16. 16 Basic resolution provided by MFI-3 Requirements about changes Usually proposed by domain experts Incomplete  Change Closure Requirements about consistency Usually proposed by information system* engineer Incomplete  Consistency Closure Possible conflict between various requirements Evolution Strategy *Ontology based information systems Constraint Model (2/9)

17. 17 How to get Constraints Ontology Metamodel Consistency_Constraint  designating the dependency between Ontology_Atomic_Constructs Change_Constraint  designating the dependency between Changes Constraint Model (3/9)

18. 18 An example-Ontology Constraint Model(4/9)

19. 19 An example-Change Change_Constraint User_Requested_Change {Retire(Daisy)} Change_Closure {Retire(Daisy), Retire(instanceOf(Teacher,Daisy)), Retrie(teach(Daisy,Java_Language))} Constraint Model(5/9)

20. 20 An example-Consistency Consistency_Constraint User_Requested_Consistency {Java_Language} Consistency_Closure {Java_Language, Course, instanceOf(Course,Java_Language)} Constraint Model(6/9)

21. 21 An example-Evolution Strategy 1/2 Constraint Model(7/9)

22. 22 An example-Evolution Strategy 2/2 Constraint Model(8/9)

23. 23 Constraint Model Constraint Model(9/9)

24. 24 Change Propagation Change to ROChange to dependent RO Change to dependent LO Change to LO Note: RO:Reference Ontology LO:Local Ontology Change Propagation Model (1/2)

25. 25 Change Propagation Model Change Propagation Model (2/2)

26. 26 Evolution Information Model Evolution Info Model

27. 27 Thank You! hekeqing@public.wh.hb.cn heyangfan927@163.com wangchong_whu@yahoo.com.cn