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Web of data

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Introduction to Semantic Web
Technologies & Linked Data
Oktie Hassanzadeh
University of Toronto

March 2011

CS 443: Database Management Systems - Winter 2011

Outline
2

Introduction
Semantic Web Technologies
Resource Description Framework (RDF)
Querying RDF data (SPARQL)

Linked Data
Linked Data Principles
Linking Open Data Community Project
Example Data Sources
Example Applications

3

Introduction
Web of Documents vs. Web of Data

Web of Documents
4
Untyped
Links

Untyped
Links

Untyped
Links

HTML

HTML

HTML

A

B

C

API/
XML

D

Primary objects: documents
Links between documents (or parts of them)
Degree of structure in data: fairly low
Implicit semantics of contents
Designed for: human consumption
Based on presentations by Chris Bizer, Richard Cyganiak, Tom Heath, available at 

Web of Documents: Problem
5

?

thing
?

?

Are two documents
talking about the same
“thing”?

thing
?

?
Untyped
Links

?

Untyped
Links

Untyped
Links

HTML

HTML

HTML

A

B

C

Based on presentations by Chris Bizer, Richard Cyganiak, Tom Heath, available at 

API/
XML

D

Example Query
6

Elvis Presley
1935 - 1977
Will there ever be someone like him again?
Based on presentation by Lauw, Schenkel, Suchanek, Theobald and Weikum, available at 

Example Query
7

Another Elvis

Elvis Presley: The Early Years
Elvis spent more weeks at the top of the charts
than any other artist.


Based on presentation by Lauw, Schenkel, Suchanek, Theobald and Weikum, available at 

Example Query
8

Another singer called Elvis, young

Personal relationships of Elvis Presley – Wikipedia
...when Elvis was a young teen.... another girl whom the
singer's mother hoped Presley would .... The writer called
Elvis "a hillbilly cat”
en.wikipedia.org/.../Personal_relationships_of_Elvis_Presley

Based on presentation by Lauw, Schenkel, Suchanek, Theobald and Weikum, available at 

Example Query
9

Dear Mr. Page, you don’t understand me. I just...

Elvis Presley - Official page for Elvis Presley
Welcome to the Official Elvis Presley Web Site, home of the
undisputed King of Rock 'n' Roll and his beloved Graceland ...


Based on presentation by Lauw, Schenkel, Suchanek, Theobald and Weikum, available at
Introduction to Semantic Web
Introduction to Semantic Web
Technologies & Linked Data
Technologies & Linked Data
Oktie Hassanzadeh
Oktie Hassanzadeh
University of Toronto
University of Toronto
March 2011
March 2011
CS 443: Database Management Systems
CS 443: Database Management Systems
-
-
Winter 2011
Winter 2011
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