136 Big Data Computing
anyone to distributedly make statements about any resource on the
Web. In this regard, an RDF description turns out to be a set of URI
triples, with the standard intended meaning. It follows the ideas of
semantic networks and graph data specications, based on univer-
sal identiers. It gives basic tools for linking data, plus a lightweight
machinery for coding basic meanings. It has two levels:
a. Plain RDF is the basic data model for resources and relations
between them. It is based on a basic vocabulary: a set of prop-
erties, technically binary predicates. Formally, it consists of tri-
ples of the form (s,p,o) (subject–predicate–object), where s,p,o are
URIs that use distributed vocabularies. Descriptions ...