
Chapter 1
The Quest for Fuzzy Logic in
Semantic Web Languages
Semantic Web Languages (SWLs), such as triple languages RDF & RDFS [77]
(Resource Description Framework), conceptual languages of the OWL 2 family
(Ontology Web Language) [340] and rule languages of the RIF (Rule Inter-
change Format) family [365], are languages to provide a formal description of
concepts, terms, and relationships within a given knowledge domain and to
be used as well to write the metadata that typically annotates any kind of
web-data.
A large body of work has been carried out addressing various aspects, such
as computational complexity, reasoning algorithms, and scalability ...