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Stefan Decker Stanford University Mike Dean BBN Technologies.

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1 Stefan Decker Stanford University Mike Dean BBN Technologies

2 Objectives support World Wide Web (WWW) content that is easily used by intelligent agents and other programs enable the Semantic WebSemantic Web

3 Approach: Languages and Tools leverage existing work W3C Resource Description Framework (RDF & RDFS)Resource Description Framework (RDF & RDFS) European Ontology Inference Layer (OIL)Ontology Inference Layer (OIL) UMaryland Simple HTML Ontology Extensions (SHOE)Simple HTML Ontology Extensions (SHOE) work with W3C to define languages (standards transition) work openly (www.daml.org)www.daml.org develop prototype tools to span the DAML lifecycle ontology creation and editing, translation and mapping distributed knowledge bases markup editors validation services DAML APIs DAML-aware browsers applications

4 DAML+OIL Ontology Language Joint Committee US DAML and EU Semantic Web Technologies participants US DAMLEU Semantic Web Technologies released March 2001 technical discussions take place on the www-rdf-logic@w3.org email list (feedback!) www-rdf-logic@w3.org

5 DAML+OIL Language Features grounded in the WWW (URI naming, XML syntax, HTTP) -- strong implications for diversity, scalability, security, etc. classes and instances class construction primitives (intersection, union, complement) fine grained property constraints cardinality constraints formal semantics: model-theoretic and axiomatic –> enables inferencingmodel-theoretic axiomatic

6 Available Tools DAML Ontology Library: clearinghouse DAML Ontology Library Stanford RDF APIRDF API OilEd: ontology editor OilEd Chimaera: ontology analyzer Chimaera DAML Validator (under development) DAML Validator DAML Crawler: spider DAML Viewer, PalmDAML, and HyperDAML: navigator GUIs DAML ViewerPalmDAMLHyperDAML

7 DAML Languages: Future Work incorporate feedback proposal(s) to new W3C Semantic Web ActivityW3C Semantic Web Activity rules (working with RuleML Initiative)RuleML Initiative logic, proof-checking...

8 More Information About DAML: http://www.DAML.org About Semantic Web efforts: http://www.SemanticWeb.org

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