OpenHPI 1.5 - The Vision of the Semantic Web

Dr. Harald Sack

Hasso Plattner Institute for IT Systems Engineering

University of Potsdam

Spring 2013

Semantic Web Technologies

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Lecture 1: The Web of Data 05: The Vision of the Semantic Web

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Semantic Web Technologies , Dr. Harald Sack, Hasso-Plattner-Institut, Universität Potsdam

Lecture 1: The Web of Data

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Open HPI - Course: Semantic Web Technologies


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05: The Vision of the Semantic Web OpenHPI - Course Semantic Web Technologies - Lecture 1: The Web of Data


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Tim Berners-Lee, Semantic Web Roadmap, Sept 1998

„The Web was designed as an information space, with the goal that it should be useful not only for human-human communication, but also that machines would be able to participate and help… “

From the World Wide Web to the Web of Data

http://www.w3.org/DesignIssues/Semantic.html

http://www.w3.org/DesignIssues/Semantic.html


5Precondition:• Content can be read and

interpreted correctly (= „understood“) by machines

Natural Language Processing• Technologies of traditional

Information Retrieval (Search Engines)



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Semantic Web• Natural language web content will

be explicitly annotated with semantic metadata

• Semantic metadata encode the Meaning (Semantics) of the content and can be read and interpreted correctly by machines


Precondition:• Content can be read and

interpreted correctly (= „understod“) by machines

Natural Language Processing• Technologies of traditional

Information Retrieval (Search Engines)



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„Understanding“ Content on the Web


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Text: „Why snub me, Fab?“



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• Disambiguationsolution of linguistic ambiguities




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• Disambiguationsolution of linguistic ambiguities


Fabio Capello ?

Entity MappingDisambiguation

FAB ?

FAB ?

Manager of the UK national Football team

the Film Advisory Board

Federación Atlética de Bolivia

Fab Melo ? Brazilian Basketball Player

Fab ? a detergent

Fab ? a Canadian gay magazine

Fabrizio Moretti ? Drummer of The Strokes


http://en.wikipedia.org/wiki/Federaci%C3%B3n_Atl%C3%A9tica_de_Bolivia





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Fabio Capello

Entity Mapping

Entity

• The Meaning (Semantics) of entitiesand classes must be defined explicitly.




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Fabio Capello

Entity Mapping

Entity

Soccer Manager

is a

Class





10

Fabio Capello

Entity Mapping

Entity

Soccer Manager

is a

Class

Person

is subclass of

Class





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Fabio Capello (entity)

Soccer Manager

is a

(class)

Class-membership has class

•The Meaning (Semantics) is expressed with the help of appropriate knowledge representations (Ontologies)



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Fabio Capello (entity)

Soccer Manager

is a

(class)

Class-membership has class

Person

is subclass of

(class)

superclass

subclass

is subclass of

•The Meaning (Semantics) is expressed with the help of appropriate knowledge representations (Ontologies)



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Fabio Capello

Soccer Manager

Person

is aEntities

Classes

is subclass of

„Understanding“ Content on the Web (III)

•The Meaning (Semantics) is expressed with the help of well suited knowledge representations (Ontologies)


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Fabio Capello

Soccer Manager

Person PlacebirthPlace

is aEntities

Classes

is subclass of




12

Fabio Capello

Soccer Manager


is aEntities

Classes

is subclass of

San CanzianbirthPlace

is a




12

Fabio Capello

Soccer Manager


DatebirthDate

is aEntities

Classes

is subclass of


is a




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Fabio Capello

Soccer Manager


DatebirthDate

is aEntities

Classes

is subclass of


is a

birthDate1946-06-18

is a




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Tim Berners-Lee, James Hendler, Ora Lassila: The Semantic Web, Scientific American, 284(5), pp. 34-43(2001)

What is the Semantic Web?

„The Semantic Web is an extension of the current web in which information is given well-defined meaning, better enabling computers and people to work in cooperation"

http://www.bibsonomy.org/author/Berners-Lee

http://www.bibsonomy.org/author/Berners-Lee

http://www.bibsonomy.org/author/Hendler

http://www.bibsonomy.org/author/Hendler

http://www.scientificamerican.com/article.cfm?id=the-semantic-web

http://www.scientificamerican.com/article.cfm?id=the-semantic-web


14•The Meaning of Information (Semantics) is made explicit by

formal (structured) and standardized knowledge representations (Ontologies).

• Thus it will be possible,

•to process the meaning of information automatically

•to relate and integrate heterogeneous data

•to deduce implicite (not evident) information from existing (evident) information in an automated way

The Semantic Web is kind of a global database that contains a universal network of semantic propositions.

The Semantic Web - a Web of Data


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Das Semantic Web

•

Semantic Web ...towards an „intelligent“ Web


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06: The Vision of the Semantic Web Pt.2 OpenHPI - Course Semantic Web Technologies - Lecture 1: The Web of Data

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OpenHPI 1.5 - The Vision of the Semantic Web

Education

suited knowledge representations

world wide web

classes soccer manager

semantic web technologies

class soccer manager

knowledge representations

fabio capello

semantic web