Information Technology Reference
In-Depth Information
Entity
ontology (IRE) (Presutti and Gangemi 2008), which has evolved in the
The Identity of Resources on the Web (IRW) ontology presented here via several
iterations (Halpin and Presutti 2009).
IRW is a small ontology at the core of an ontology network. More specifically,
IRW defines the core concepts of the Web architecture and can be extended by
specialized ontology modules in order to address more specific Web domains such
as HTTP transactions and Linked Data. IRW reuses existing ontologies, some of
which are ontology design patterns (Gangemi and Presutti 2009). The following list
summarizes the prefixes that are used in the ontology and associates them with their
respective ontologies. Terms in IRW ontology will be given in
teletype
font, and
if no namespace is given, we will assume the
irw:
namespace.
Prefix
URI
irw:
purl.org/NET/irw/#
ir:
ontologydesignpatterns.org/cp/owl/ir.owl#
comp:
ontologydesignpatterns.org/cp/owl/componency.owl#
http:
ontologydesignpatterns.org/ont/web/http2irw.owl#
ldow:
ontologydesignpatterns.org/ont/web/ldow2irw.owl#
tag:
ontologydesignpatterns.org/ont/web/tag2irw.owl#
ont:
w3.org/2006/gen/ont#
rdfs:
w3.org/2000/01/rdf-schema#
rdf:
w3.org/1999/02/22-rdf-syntax-ns#
owl:
w3.org/2002/07/owl#
Notice that the stable version of the ontology can also be accessed via its PURL.
The latest version of the IRW ontology is available online.
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While the IRW
ontology in full cannot be graphically explicated due to lack of space on a printed
page, the primary classes and properties are given in Fig.
3.6
. The IRW-related
elements needed for the example of 303 redirection are given in Fig.
3.5
.TheIRW
ontology defines the class
Resource
to be equivalent to
rdfs:Resource
6
as
it expresses the same intuition.
3.4.1
Resources and URIs
The notion of a URI is modeled as a class,
URI
. As XML Schema data-types for
URIs are not extensible, modeling URIs as a class allows us to talk about different
kinds of URIs, such as IRIs (Internationalized Resource Identifiers) and Semantic
Web URIs. A property
identifies
can then connect a URI to a resource. Since
6
Notice that the ontology is encoded in OWL2.
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