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Central to this library is the module \file{rdf_db.pl}, providing
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storage and basic querying for RDF triples. This triple store is filled
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using the RDF parser realised by \file{rdf.pl}. The storage module can
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quickly save and load (partial) databases. The modules \file{rdfs.pl}
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and \file{owl.pl} add querying in terms of the more powerful RDFS and
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OWL languages. Module \file{rdf_edit.pl} adds editing, undo, journaling
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and change-forwarding. Finally, a variety of XPCE modules visualise and
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edit the database. Figure \figref{modules} summarised the modular
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Central to this library is the module \pllib{semweb/rdf_db.pl},
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providing storage and basic querying for RDF triples. This triple store
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is filled using the RDF parser realised by \pllib{rdf.pl}. The storage
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module can quickly save and load (partial) databases. The modules
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\pllib{semweb/rdfs.pl} and \pllib{semweb/owl.pl} add querying in terms
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of the more powerful RDFS and OWL languages. Module
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\pllib{semweb/rdf_edit.pl} adds editing, undo, journaling and
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change-forwarding. Finally, a variety of XPCE modules visualise and edit
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the database. Figure \figref{modules} summarised the modular design.
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\postscriptfig[width=0.8\linewidth]{modules}
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{Modules for the Semantic Web library}
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for literals with a \emph{different} language identifier. Please note
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that this option will cause all literals without language tag to be
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interpreted using \arg{XMLLang}.
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\termitem{namespaces}{+List}
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Explicitely specify saved namespace declarations. See rdf_save_header/2
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option namespaces for details.
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\end{description}
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\predicate{rdf_graph}{1}{?DB}
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\label{sec:rdfs}
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\index{RDF-Schema}%
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The \pllib{rdfs} library adds interpretation of the triple store in
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terms of concepts from RDF-Schema (RDFS). There are two ways to provide
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support for more high level languages in RDF. One is to view such
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languages as a set of \jargon{entailment rules}. In this model the
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rdfs library would provide a predicate \predref{rdfs}{3} providing
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the same functionality as rdf/3 on union of the raw graph and triples
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that can be derived by applying the RDFS entailment rules.
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The \pllib{semweb/rdfs} library adds interpretation of the triple store
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in terms of concepts from RDF-Schema (RDFS). There are two ways to
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provide support for more high level languages in RDF. One is to view
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such languages as a set of \jargon{entailment rules}. In this model the
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rdfs library would provide a predicate \predref{rdfs}{3} providing the
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same functionality as rdf/3 on union of the raw graph and triples that
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can be derived by applying the RDFS entailment rules.
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Alternatively, RDFS provides a view on the RDF store in terms of
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individuals, classes, properties, etc., and we can provide predicates
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that query the database with this view in mind. This is the approach
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taken in the \pllib{rdfs.pl} library, providing calls like
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taken in the \pllib{semweb/rdfs.p}l library, providing calls like
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\term{rdfs_individual_of}{?Resource, ?Class}.%
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\footnote{The SeRQL language is based on querying the deductive
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closure of the triple set. The SWI-Prolog SeRQL
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\index{Sesame}\index{SeRQL}%
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The SWI-Prolog SemWeb package is designed to provide access to the
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Semantic Web languages from Prolog. It consists of the low level
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\file{rdf_db.pl} store with layers such as \file{rdfs.pl} to provide
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\file{rdf_db.pl} store with layers such as \pllib{semweb/rdfs.pl} to provide
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more high level querying of a triple set with relations such as
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rdfs_individual_of/2, rdfs_subclass_of/2, etc.
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\url[SeRQL]{http://www.openrdf.org} is a semantic web query language
added
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packages/semweb/semweb.doc
