openhpi 3.6 - the limits of rdf(s)

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Dr. Harald Sack

Hasso Plattner Institute for IT Systems Engineering

University of Potsdam

Spring 2013

Semantic Web Technologies

Lecture 3: Semantic Web - Basic Architecture II06: The Limits of RDF(S)

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

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Lecture 3: Semantic Web - Basic Architecture II

Open HPI - Course: Semantic Web Technologies

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

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2. Semantic Web Basisarchitektur2.7 Warum RDF noch nicht ausreicht

06 The Limits of RDF(S)

Open HPI - Course: Semantic Web Technologies - Lecture 3: Semantic Web Basic Architecture

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

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2. Semantic Web Basisarchitektur2.7 Warum RDF noch nicht ausreicht

Is there more in the World than RDF(S)?


5 Locality of global properties

Problem: Cows only eat vegetablesOther animals also eat meat.

Why RDF(S) is not enough

Animal eats FoodDomain Range

Vegetables

Meat

subClassOf

subClassOf


6Disjunctive Classes

Problem: Subclass relation cannot express disjunctive class (subclass) membership


Human

Woman

Man

subClassOf

subClassOf


6Disjunctive Classes

Problem: Subclass relation cannot express disjunctive class (subclass) membership


Human

Woman

Man

subClassOf

subClassOf

≠


7Class Combinations

Problem: Combination of classes define a new class.New class contains only members from given class combinations.


Motorist

Pedestrian

Motorcyclist

Cyclist

Road User

subClassOf

subClassOf

subClassOf

subClassOf


8Cardinality Restrictions

Problem: Every human (usually) has two partents


Human ParenthasParent


9 Special Property Constraints

• Transitivity (e.g. „is greater than“)

• Uniqueness (e.g. „is mother of“)

• Inversiveness (e.g. „is parent of“ and „is child of“)



9 Special Property Constraints

• Transitivity (e.g. „is greater than“)

• Uniqueness (e.g. „is mother of“)

• Inversiveness (e.g. „is parent of“ and „is child of“)

We need more se

mantic express

ivity!



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Semantic Web Basic ArchitectureThe Languages of the Semantic Web


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Ontolo

giesnext Lecture:

Lecture 4: Knowledge Representations I

Open HPI - Course: Semantic Web Technologies

openhpi 3.6 - the limits of rdf(s)

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