Properties
are the attributes of resources, which have either atomic entities (strings, numbers,
etc.) or other resources as their values. For a person to understand the semantics of
a sentence, a sentence is organized in a subject-verb-object (SVO) form. Similarly,
the fundamental design pattern of RDF is to structure data as resource-propertyresource
triples. Here, resource can represent both subject and object in the SVO
A Bas s for the Semant c Web and E-Bus ness
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form, while property (relationship between resources) represents the verb in the
SVO form. Thus, the RDF files can be processed semantically. An RDF model can
be represented in three ways, namely, graph syntax, triple syntax, and RDF/XML
syntax. In this chapter, we focus on the XML representation of RDF.
RDF organizes information in the SVO form, but it does not define the many
standard primitives (see Table 1) required to construct ontologies. Thus, RDFS
(Brickley & Guha, 2004) is created to provide some more basic primitives, such as
???subClassOf??? and ???subPropertyOf??? (to represent the relationships between classes
or properties).
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