Community-driven Ontology Construction using the myontology Platform

Transcription

1 Community-driven Ontology Construction using the myontology Platform Prof. Dr. Martin Hepp Katharina Siorpaes, MSc STI Innsbruck, Universität Innsbruck

2 What is the Semantic Web? The Gopher HTTP/HTML Analogy 1990: Gopher Textual information mid 1990s: HTML Multimedia added 2006 and beyond: RDF, OWL Meaning added Gopher screenshot courtesy of the University of Minnesota. Semantic Web screenshot courtesy of Ontotext, April 16,

3 Two Paths to Automation Empower machines to process natural language (HLT approach) Encode data in a machine-suitable way. Modell 1 kostet 4 EUR inkl. MwSt <PRODUCT> <NAME>Modell 1</NAME> <PRICE cur= EUR vat= yes >4</PRICE> </PRODUCT> Semantic Web <PRICE cur= EUR vat= included >4</PRICE> April 16,

4 Datamodeling = Specifying Boxes, Relationships, and Important Attributes Intercity Hotel Hotel zum Bären Room 1 Room 2 Room 1 Room 2 Hotel (Hotels) has Rooms Name Street Room size in sqft Balkony y/n? April 16,

5 Ontology Construction: Finding a structure for information that is suitable for many users and many purposes Not just for a particular application or database, but such that it fits many applications! Hotel (Hotels) has Rooms Name Street Room size in sqft Balkony y/n? April 16,

6 Standards, Data, Ontologies Ontology Popular Systems Data Web of of Data Popular Exchange Standards Proprietary Systems Bottleneck 1: Can we derive instance data according to the structure of the ontology? ideally, no manual intervention Bottleneck 2: Can we convert instance data into common target structures? sufficient level of detail for rule-based transformation

7 Goal: Objective Structures Precision in Meaning: What do we really want to say about an object? Room vs. Offer to rent a room Student: Human being that is a student vs. the role of being a student Event vs. ticket that grants me access to a particular event April 16,

8 How Visible are Austrian Tourism Offers on the Web?

9 Hotel Search: Most Relevant Information Categories Location 67% List Price 62% Room Features 39% Star Rating Breakfast/Meals Directions Staff Accomodation Features 28% 25% 24% 24% 22% Swimming Pool Technical Equipment Parking Images 11% 10% 10% 9% Sauna 6% Fitness Room 5% Based on Austrian Chamber of Commerce data; in: Hepp, Siorpaes, Bachlechner (2006) April 16,

10 Representative Sample of WWW Coverage No WWW presentation; 5% Unknown / Not found; 2% No vendor Web site, but tourism portal member; 33% Vendor-operated Web site; 60% Hepp, Siorpaes, Bachlechner (2006) April 16,

11 Percentage of Accommodation Web Pages That Provide Respective Information Accommodation Web sites providing sufficient information for decision making 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 98% 70% 55% 57% 55% 58% 52% 43% 37% 33% 20% 15% 10% 3% 7% 2% Location List Price Room Features Star Rating Breakfast/Meals Directions Staff Accomodation Features Swimming Pool Technical Equipment Parking Images Sauna Fitness Room Availability Category Hepp, Siorpaes, Bachlechner (2006) April 16,

12 Match between Information Supply and Demand Information Supply and Demand Information Supply Fitness Room Location 70% 60% List Price Information Demand Images Sauna 50% 40% 30% 20% 10% 0% Room Features Star Rating Parking Breakfast/Meals Technical Equipment Directions Swimming Pool Staff Accomodation Features Hepp, Siorpaes, Bachlechner (2006) April 16,

13 The myontology Platform for Collaborative Ontology Construction Walk-through

14 Step 1: Register April 16,

15 Welcome to myontology Start page. Navigation: tag clouds. April 16,

16 Navigation: Tree view Create new element April 16,

17 Create new ontology Creating a domain vocabulary (ontology) Create new concept within ontology April 16,

18 Create new concept April 16,

19 Create new property April 16,

20 Create new property April 16,

21 Assign properties April 16,

22 History Function April 16,

23 Freeze Points Stable Snapshots April 16,

24 Export in OWL April 16,

25 April 16,

26 Import April 16,

27 Thank you! Prof. Dr. Martin Hepp Katharina Siorpaes, MSc STI Innsbruck, Universität Innsbruck