
54 Foundations of Semantic Web Technologies
book:uri ex:publishedBy crc:uri .
2.4.4 Subproperties and Property Hierarchies
In the previous section, we argued that prop e rties can be conceived as sets
of individual pairs and hence exhibit some similarity to classes. Thus, one
might wonder wheth er modeling constructs in analogy to subclass relation-
ships would also make sense for properties. This is indeed the case: RDFS
allows for the specification of subproperties. For example, the property de-
noted by the URI ex:isHappilyMarriedTo is certainly a subproperty of the
one ex:isMarriedTo refers to, as the happily married couples form a (most
probably