No Sistema de Organizacao para estruturar os conteudos informacionais (Esquema/Estrutura) podem ser utilizadas as seguintes tecnologias da Web Semantica: XML, RDF,
RDF Schema, OWL, SPARQL e SWRL, e que podem ser percebidas na aplicacao do Knowlegde Graph no Google.
RDF Schema is a vocabulary for describing properties and classes of RDF resources, with the necessary semantics for generalization--hierarchies of such properties and classes.
Path Query Processing Based on
RDF Schema Information
These results encourage us to develop algorithms to solve the tasks of query answering and semantic reasoning, and to extend the proposed approach to represent
RDF Schema (RDFS) [12, 13] data models.
Semantic standards including RDF (resource description framework), RDFS (
RDF schema) and OWL (Web Ontology Language) clearly show these semantic relationships (World Wide Web Consortium (W3C), 2002, 2003).
Ontology described using an
RDF schema is a graph G = <{C [union] L},P,[S.sup.C],[S.sup.P]>, where C is a set of nodes labelled with a class name, L is a set of nodes labelled with a data type (literals), [S.sup.C] is a subsumption between classes C , P is a set of arcs of the form < [c.sub.1], p, [c.sub.2] > , where [c.sub.1] [member of] C, [c.sub.2] [member of] C [union] L, p is a property name, and [S.sub.P] is a subsumption between properties P.
The next most popular ontologies include Resource Description Framework, (3) Friend Of A Friend (FOAF), (4)
RDF Schema, (5) and Trackback of RSS.
These tools and methods include the Resource Description Framework (RDF), a variety of data interchange formats (RDF/XML, N3, Turtle, N-Triples), and notations such as
RDF Schema (RDFS) and Web Ontology Language (OWL).
The Semantic Web is comprised of the standards and tools of XML, XML Schema, RDF,
RDF Schema and OWL.