Ontology Web » Ontology

Sparql search engine queries

Working Ontologist — Tue, 26 Oct 2010 08:07:07 +0000

By Pim Keizer

A simple example of some generic sparql queries for use in a search engine.

Search phrase: “Adidas”

Instance match

Select all instances with label "Adidas".

SELECT *

WHERE {

?resource rdfs:label "Adidas" .

}

Find synonyms

Select all classes that are of the same type.

SELECT ?synonyms

WHERE {

?resource rdfs:label "Adidas" .

?resource rdf:type ?type .

?synonyms rdf:type ?type .

}

Find other instances with the same type

Select all instances of the current type.

SELECT ?otherInstances

WHERE {

?resource rdfs:label "Adidas" .

?resource rdf:type ?type .

?objProp rdfs:range ?type .

?otherInstances ?objProp ?resource .

}

Find other classes with the same properties

Select all classes with the same properties as the current instance with :label "Adidas".

SELECT ?otherClasses

WHERE {

?resource rdfs:label "Adidas" .

?resource rdf:type ?type .

?objProp rdfs:range ?type .

?otherInstances ?objProp ?resource .

?otherInstances rdf:type ?otherClasses .

}

Ontology Design Patterns (ODP)

Working Ontologist — Tue, 03 Aug 2010 06:55:56 +0000

Regarding best practice hints, the following two links correspond to two repositories of Ontology Design Patterns:

Media Annotations Working Group Video, Audio, Images

Working Ontologist — Fri, 07 May 2010 04:49:54 +0000

The Media Annotations Working Group published an ontology for media resource.

O verview of the Media Annotations Working Goup

Startup of new semantic project

Working Ontologist — Fri, 22 Jan 2010 11:32:58 +0000

Just started a new semantic web project. I will write about this on this website!

It is a project about traveling

OWL 2 Web Ontology Language Primer

Working Ontologist — Mon, 14 Dec 2009 15:14:45 +0000

In the W3C Recommendation of 27 October 2009 the OWL 2 Web Ontology Language is presented.

The primer provides an approachable introduction to OWL 2, including orientation for those coming from other disciplines.

Visit W3C

RDF stands for Resource Description Framework

Working Ontologist — Tue, 08 Dec 2009 08:17:57 +0000

RDF is short for Resource Description Framework. RDF is the language for describing resources and contents in the semantic web. In the semantic web RDF is used to describe resources on the web. Resources are addressed by a unique URI. A URI looks like a normal Internet URL.

Look at the following fragment of a RDF file:

xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" xmlns="http://example.org/pets#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xml:base="http://example.org/pets">

What is the Semantic Web?

Working Ontologist — Tue, 08 Dec 2009 08:00:39 +0000

Describing things in a way that computer applications can understand it.

The semantic web describes relations between concepts. For example:

A isPartOf B B hasType C C isMemberOf D

Also properties of concepts can be described:

A hasAge X B hasSize X C has Length X

Where in this case X could be of type Integer.

Understanding the Web Ontology Language? (OWL)

Working Ontologist — Tue, 10 Nov 2009 14:00:07 +0000

The Web Ontology Language (OWL) is a standard for creating web ontologies. It is an official W3C standard.

With a well created ontology you can query for data.

Wiki says

Working Ontologist — Fri, 25 Sep 2009 07:33:16 +0000

"In computer science and information science, an ontology is a formal representation of a set of concepts within a domain and the relationships between those concepts. It is used to reason about the properties of that domain, and may be used to define the domain." (http://en.wikipedia.org/wiki/Ontology_%28information_science%29)

W3Schools, Introduction to OWL

Working Ontologist — Thu, 03 Sep 2009 06:15:07 +0000

W3Schools has very useful information for the beginner. If you’re not familiar with the concept of OWL, you should start with this website. Many examples.

Visit websites