The Semantic Web - Social Semantics: The Search for Meaning on the Web - page 69

Fig. 3.6 The main elements of the IRW network of ontologies is illustrated as a graph. Boxes with
the symbol “C” are classes, while those with a small arrow inside are datatypes. Arcs labelled as
“subClassOf” represent rdfs:subClassOf relations between classes. The other arcs are either
object properties or datatype properties, depending on the range node. The direction of an arc
indicates the domain and range of the property. Two arrows that meet on their edges indicate a
relation whose domain and range is the given by the same class
we want to associate a URI with character strings (possibly with the XML Schema
data-type for URIs) such as ' http://www.example.org, ' wealsohaveaproperty
called hasURIString . This property has various (functional) sibling children
such as one relating IRIs to URIs, so that an IRI given in the Japanese character
can be a URI. The core properties we include are hasRelativeURIString and
hasAbsoluteURIString for the conversion of relative URIs to absolute URIs.
￿ Resource : An OWL Class. “Anything that might be identified by a URI”
(Jacobs and Walsh 2004). This class is meant to express the same intuition of
rdfs:Resource hence it is defined as equivalent to rdfs:Resource .
- owl:equivalentTo rdfs:Resource
￿ URI : An OWL Class. An abbreviation for Uniform Resource Identifier. “A global
identifier in the context of the World Wide Web” (Jacobs and Walsh 2004). Any
identifier that follows the role given in IETF RFC 3986 can be an instance of this
class, even if it is an IRI that has a conversion to a URI or uses a scheme such as