A specific resource together with a named property plus the value of that property for that resource
is an RDF statement. These three individual parts of a statement are called, respectively, the
subject, the predicate, and the object. The object of a statement (i.e., the property value) can be
another resource or it can be a literal; i.e., a resource (specified by a URI) or a simple string or
other primitive datatype defined by XML. In RDF terms, a literal may have content that is XML
markup but is not further evaluated by the RDF processor.