The Standardization of Semantic Web Ontology

The Standardization of Semantic Web Ontology
Dr. Myungjin Lee

The Semantic Web

The Semantic Web
The Semantic Web is not a separate Web but an extension of the current one, in which information is given well defined meaning, better enabling computers and people to work in cooperation.
By Tim Berners-Lee
The Semantic Web is a group of methods and technologies to allow machines to understand the meaning - or "semantics" - of information on the World Wide Web.
From Wikipedia
3

Semantic Web Stack
The Semantic Web Stack, also known as Semantic Web Cake or Semantic Web Layer Cake, illustrates the architecture of the Semantic Web.
Semantic Web - XML2000 (2000)
4

Semantic Web Stack
Representing Knowledge
in the Semantic Web(2005)
Rule Interchange Format (RIF)
Highlight (2007)
5

Technologies Classified by W3C
6

Comparing the Stack with Classification
Vertical Applications
Inference
Vocabularies
Query
Linked Data
7

Recommendations for the Semantic Web
8
RIF
OWL 2
OWL 1
SPARQL
RDFS
RDF

Other Specifications
9

Web Ontology Language

Web Ontology Language
The Web Ontology Language (OWL) is a family of knowledge representation languages for authoring ontologies.
From Wikipedia
An ontology is an explicit specification of a conceptualization.
By Tom Gruber
11
OWL 2
OWL 1

OWL 2 Web Ontology Language
12

OWL 2 Documents
13

OWL 2 Syntaxes
14

Expressiveness of OWL 2
Attributive language. This is the base language which allows:
Atomic negation
Concept intersection
Universal restrictions
Limited existential quantification
Complex concept negation
Role hierarchy (subproperties - rdfs:subPropertyOf)
Nominals. (Enumerated classes of object value restrictions - owl:oneOf, owl:hasValue).
Inverse properties
Functional properties
Cardinality restrictions (owl:Cardinality, owl:MaxCardinality)
Use of datatype properties, data values or data types
Limited complex role inclusion axioms; reflexivity and irreflexivity; role disjointness
Qualified cardinality restrictions
15
OWL DL
OWL Lite
OWL 2

New Functionality of OWL 2
Simple metamodeling capabilities
Punning
Extended Annotations
Annotations
Axioms about annotation properties
Other Innovations
Declarations
Top and Bottom Properties
IRIs
Imports and Versioning
Minor features
Anonymous Individuals
Inverse Properties
16
Syntactic sugar
DisjointUnion
DisjointClasses
NegativeObjectPropertyAssertion and NegativeDataPropertyAssertion
New constructs for properties
Self Restriction
Property Qualified Cardinality Restrictions
Reflexive, Irreflexive, and Asymmetric Object Properties
Disjoint Properties
Property Chain Inclusion
Keys
Extended datatype capabilities
Extra Datatypes and Datatype Restrictions
N-aryDatatypes
Datatype Definitions
Data Range Combination

OWL 2 Profiles
OWL 2 EL
the expressive power used by many large-scale ontologies
OWL 2 QL
the expressive power typically used in simple ontologies like thesauri, and (most of) the expressive power of ER/UML schemas
OWL 2 RL
for OWL 2 applications that can trade the full expressivity of the language for efficiency
17
OWL
RL
OWL
EL
OWL
QL

Question and Answer
18

http://www.semantics.kr	160
http://legoman.tistory.com	13
http://www.hanrss.com	1

The Standardization of Semantic Web Ontology

by Myungjin Lee

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