A Tool to Support Ontology Creation Based on Incremental Mini-ontology Merging

1. A Tool to Support Ontology Creation Based on IncrementalMini-ontology Merging Zonghui Lian

2. Introduction • Ontology-based information extraction • Robust to change • Multi-slot filling • Source-independent • Drawback: ontology has to be generated manually • Tango (Table ANalysis for Generating Ontologies) An information gathering engine that infers the unknown objects and relations in a known context into ontologies automatically

3. TANGO

4. TANGO • Source table understanding • Constraints discovery • Concept matching • Ontology merging • Domain ontology adjusting

5. User’s interactions Ontology mapping KB conflict checking Make suggestion Ontology Merging The Flow of Ontology Integration Mini-ontology Data storage

6. Research Issues • Name conflict detection • Union/selection detection and merging • Composition/decomposition detection and merging • Constraint conflict detection • Relationship set conflict detection • New concept detection and merging • Ontology consistency checking after integration

7. Name Conflict Detection

8. Union/Selection Detection & Merging Graduate Student is a subset of Student

9. Composition/Decomposition Detection & Merging Name = First Name + Last Name

10. Constraint Conflict Detection

11. Constraint Conflict Detection

12. Relationship Set Conflict Detection ?

13. Relationship Set Conflict Detection

14. Other Issues • New concept detection and merging • Ontology consistency checking after mapping

15. Ontology Mapping • Based on mapping technique introduced in EXD04 • Need to make improvement and change according to the requirements of ontology mapping

16. Ontology Mapping • Data-value characteristics detection • Schema mapping: data values in tables • Ontology mapping: dictionaries & data values in a set of source tables • Reference ontology inference • Schema mapping: reference ontology • Ontology mapping: data frame library (option)

17. Ontology Mapping • New concept detection • Schema mapping: none • Ontology mapping: mark unmatched attributes

18. Ontology Mapping • Relationship set mapping • Schema mapping: none • Ontology mapping

19. Ontology Mapping Person|Student has Name Graduate Student has Name

20. Phone Extension Ontology Mapping ?

21. Ontology Mapping • Detailed mapping information detection • Schema mapping: need to be improved • Ontology mapping: • Base on values to detect subset/superset and merge/split • Human experts refine interactively

22. Ontology Merging • Name conflict • Based on growing ontology • Union/selection merging • Generalization/specialization

23. Graduate Student is a subset of Student

24. Ontology Merging • Composition/decomposition merging • Aggregation

25. Name = First Name + Last Name

26. Ontology Merging • Relationship set merging • Map w/out conflicts: merge • Map with conflict(s): • Fake conflicts: resolve the conflict • Real conflicts: Add new relationship set(s) or change the current one

27. Evaluation • Users • A package (more than just software) • Users’ report • Analysis • Precision

28. Contributions • Can extend DEG's ontology-based data extraction system with a set of ontology growing features • Can contribute to generate a domain-specific ontology with minimal human intervention