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Semantic Web Queries by Mark Vickers Funded by NSF Semantic Web Queries by Mark Vickers Funded by NSF

Introduction n Web Queries q Traditional Web n n q Uses keyword matching Returns Introduction n Web Queries q Traditional Web n n q Uses keyword matching Returns superfluous information Semantic Web n n Uses semantic matching Returns only pertinent information 2

Background n What is the Semantic Web? q q q Provides machines “understandable” data Background n What is the Semantic Web? q q q Provides machines “understandable” data Provides answers rather than pages Ontologies provide foundation for understanding n “A shared, explicitly defined, generic conceptualization” [Gruber 93] 3

Extraction Ontology Data Frame: Value Expression: s*[$]s*(d{1, 3})*(. d{2})? Key Words: Price, Cost, Fare Extraction Ontology Data Frame: Value Expression: s*[$]s*(d{1, 3})*(. d{2})? Key Words: Price, Cost, Fare Left Context: Price, Cost, Fare Right Context: Purchase, Book, Buy Exception Expression: *. d{3, *} Lexicon File: none 4

Find the Ontology “Tell me about cruises on San Francisco Bay. I’d like to Find the Ontology “Tell me about cruises on San Francisco Bay. I’d like to know scheduled times, cost, and the duration of cruises on Friday of next week. ” 5

Find the Ontology “Tell me about cruises on San Francisco Bay. I’d like to Find the Ontology “Tell me about cruises on San Francisco Bay. I’d like to know scheduled times, cost, and the duration of cruises on Friday of next week. ” 6

Formulate Query Projection Selection Constants scheduled times San Francisco Bay cost Join Path Friday, Formulate Query Projection Selection Constants scheduled times San Francisco Bay cost Join Path Friday, Oct. 29 th duration ( ) = Result 7

Start. Time Price 10: 45 am, 12: 00 pm, 1: 15, 2: 30, 4: Start. Time Price 10: 45 am, 12: 00 pm, 1: 15, 2: 30, 4: 00 $20. 00, $16. 00, $12. 00 10: 00 am, 10: 45 am, 11: 15 am, 12: 00 pm, 12: 30 pm, 1: 15 pm, 1: 45 pm, 2: 30 pm, 3: 00 pm, 3: 45 pm, 4: 15 pm, 5: 00 pm $17. 00, $16. 00, $12. 00 Duration Source 1 1 Hour 2 8

Contributions n n English Web queries without NLP Web queries based on semantics Returning Contributions n n English Web queries without NLP Web queries based on semantics Returning answers rather than pages Semantic Web application 9