MDR for the Semantic Web : Supporting Ontology Concept

1. JTC1 SC32N1638 MDR for the Semantic Web: Supporting Ontology Concept SC32 Study Period Meeting: Future Database Needs Clearwater, Florida, USA February 06, 2007 Doo-Kwon Baik (baikdk@korea.ac.kr), Korea University Dongwon Jeong (djeong@kunsan.ac.kr), Kunsan Nat’l University Yixin Jing (yixin_jing@korea.ac.kr), Korea University SungKong Park (skpark@metarights.com), MetaRight, Inc.

2. Contents • Background • Issues • Proposed Solution • Conclusion Software System Lab., Korea University

3. Background • Semantic Web (SW) and Ontology • MDR, ISO/IEC 11179, • is a flat structure (i.e., a set of data elements describing properties of data) • has no relationships between data elements • is not suitable for the Semantic Web environment • should support ontology registration (i.e., associations) • An Ontology • might be built by various description languages (e.g., OWL, RDF, Topic Maps, KIF, etc.) • Its structure is defined using semantics (DEs) in a registry Software System Lab., Korea University

4. Issues • Consequently, there might be two issues. • Issue-1 • MDR should support the ontology concept for the Semantic Web, i.e., should be extended to register relationships (associations, predicates) between data elements: Syntax registry • Statements are also registered to a MDR registration center: Semantic registry • Issue-2 • An ontology description language-independent method should is also required Software System Lab., Korea University

5. Proposal: Conceptual Structure Issue-1 MDR (Metadata registry) 11179 data elements Syntax Registry (MDR + Predicates) Concept Level Semantic Registry (Individuals + Predicates) Instance Level Issue-2 Description (Translation) KIF Topic Maps OWL RDF etc. Software System Lab., Korea University

6. Model Definition for Issue-1 Proposed Model = (eCD, eDEC, VD, DE) ,where eCD : extended Conceptual Domain = (CD_Ind, CD_Ass) eDEC : extended Data Element Concept = (DEC_Ind, DEC_Ass) VD : Value Domain DE : Data Element • The conceptual level contains the eCD and eDEC, while the representational level contains the VD and DE. • The main extension to the current MDR is reflected with the CD_Ass and DEC_Ass, which are the association between the CD_Inds and between the DEC_Inds respectively. Software System Lab., Korea University

7. Overview of the MDR Use in SW Syntax registry Semantic registry Software System Lab., Korea University

8. Example Scenario • There are two volumes of data, country and international organization. • Two associations exist as follows: • One is the Relationship, depicts the relationship type between countries. • The other is the Role which depicts the roles that a country may play in different international organizations. Software System Lab., Korea University

9. Example Scenario (cont.) • eCD of the internationalrelationship issue • Under this eCD, several CD_Ind and CD_Ass are extracted to form a non coherent structure. • Each CD_Ind/CD_Ass contains Value Meanings. A portion of the Value Meanings is shown in the Table • eCD is used for syntax registry Software System Lab., Korea University

10. Example Scenario (cont.) • eDEC of the international relationship issue • The eDEC has the knowledge that “Korea is a member of World Trade Organization, but not a member of UN Security Council”. • eDEC is used for semantic registry. Software System Lab., Korea University

11. Example Scenario (cont.) • In “eDEC of the international relationship issue” • The valid Value Meaning of the CD_Ass is not applicable to every that of the CD_Ind. • For example, • the Value Meaning “member” can not be used to connect the Value Meaning “Korea” and “UN Security Council”. • Although member(Korea, UN Security Council) is compliant to the syntax defined by the eCD, it violates the truth. • To guarantee the Value Meanings be combined to form knowledge with correct semantic meaning, the process for semantics registry will be carried out Software System Lab., Korea University

12. Example of DE (Issue-2) • Fragments of specification in OWL for eDEC • Of course, we can define the specification in Topic Maps as TM is an element of VD Software System Lab., Korea University

13. Conclusion? • We proposed a enhanced MDR model for ontology registry for the Semantic Web • Issues for standardization? • How to support ontology concept using registries for the Semantic Web • The enhanced registry model • Registration process: Syntax registration and Semantic registration • How to use metadata enhanced registry to describe a representation (OWL, RDF, TM, etc) • Description process • Remaining issues to achieve the goals of proposed solution? • . . . . . . Software System Lab., Korea University

14. Q/A Thank you! Doo-Kwon Baik (baikdk@korea.ac.kr), Korea University Dongwon Jeong (djeong@kunsan.ac.kr), Kunsan National University Yixin Jing (yixin_jing@korea.ac.kr), Korea University SungKong Park (skpark@metarights.com), MetaRight, Inc. Software System Lab., Korea University