the semantic web: a white elephant or a new hope for the web?
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1Spring 2005Specification and Analysis of Information Systems
The Semantic WebA White Elephant or a New Hope?
Eran TochFaculty of Industrial Engineering and Management
The Technion – Israel Institute of TechnologyAdvisors: Dov Dori and Iris Reinhartz-Berger
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Agenda
1. What is the Semantic Web?
2. Applications
3. The Problem with the Semantic
Web
4. What we do + Demo
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So, what is wrong with the current Web?
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Today, a Web of Documents
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The Current Web<html> <head> <title>The Technion</title> </head> <body> Welcome to the Technion. </body></html>
HTML DocumentURL: http://www.technion.ac.il
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The Current WebHTML + URL
The Semantic Web
Vision: A Web of Data
By Tim Berners-Lee et al., Scientific American (2001)
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Humans Machines
Semantic Resource
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How do we inject
meaning?
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A common A common agreement between agreement between
partiesparties
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Ontology
• From the Greek onto: being and -logy: theory
• A common conceptualization of a domain
ConceptResource
Writes
Reads
Knows
Knows
?!
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Example: Social Networks
• Personal details (name, mail, location)• Organizations, networks• People you know (friends) • ...
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FOAF Ontology Structure
Image
Person
AgentURL
OrganizationEmail
has
has
knows
is ais a
Addresslives
Employee Ontology
WorkerCompany
is ais a
Technion Network
has
Eran
instance of
instance of
member
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OWL: Web Ontology Language
FOAF Ontology
Employee Ontology
FOAF Competito
r
Eran
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Agenda
1. What is the Semantic Web?
2. Applications
3. The Problem with the Semantic
Web
4. What we do + Demo
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Example 1: Semantic Search
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Example 2: GoPubMed
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Example 3: Friend of a Friend
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FOAF Entity
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Example 4: Semantic Web Service Composition
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FOAF Ontology
Image
Person
Agent URL
OrganizationEmail
has
has
knows
is ais a
Addresslives
hasmember
Get Address
input
output
Get Member
s
input output
26Web Services Pool
I want an application that maps my friend’s homes
Agent
User
Find FriendsGet AddressMap
Addresses
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Agenda
1. What is the Semantic Web?
2. Applications
3. The Problem with the
Semantic Web
4. What we do + Demo
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Lots of Academic Work
But with little impact on the real world
• ISWC– International Semantic Web Conference
• WWW– International World Wide Web Conference
• ER– International Conference on Conceptual Modeling
• SWUI– Semantic Web User Interfaces
• ICWE– International Conference on Web Engineering
And 30+ conferences and Workshops
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The Chicken and Egg Problem
Killer Applications
Semantic Data
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Agenda
1. What is the Semantic Web?
2. Applications
3. The Problem with the Semantic
Web
4. What we do + Demo
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What we have done
• Approximate service composition– Flexibility / Precision– Ranking– Performance– Human perception
• Tools– OPOSSUM– Liquid-Interface– Service-Crawler
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Our Approach
Ontologies
Weak-semantics Content
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Approximate Service Retrieval
Web Services Pool
Find Friendsp2
Get Addressp1
Map Addressp3
? ?
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Approximate Query Evaluation
Address
Map Address
input
Query
Map a given address
Longitude / Latitude
Map
output
AirportBusiness
Performance
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Recall-Precision Curve
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4 0.6 0.8 1
Recall
Pre
cisi
on
Opossum OWLS-MX Logic
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Demo
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Summary
1. The Semantic Web2. Ontologies3. Approximate
reasoning• Lots of questions
– What bothers you on the Semantic Web?
– Can it work?– If it would work, would
it be harmful?
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http://www.technion.ac.il/erant
Thank You
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