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.IX Title "RDF::Closure 3pm"
.TH RDF::Closure 3pm "2021-09-24" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
RDF::Closure \- pure Perl RDF inferencing
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\& use RDF::Trine::Iterator qw[sgrep];
\& use RDF::Closure qw[iri mk_filter FLT_NONRDF FLT_BORING];
\&
\& my $data = iri(\*(Aqhttp://bloggs.example.com/foaf.rdf\*(Aq);
\& my $foaf = iri(\*(Aqhttp://xmlns.com/foaf/0.1/index.rdf\*(Aq);
\&
\& my $model = RDF::Trine::Model\->temporary_model;
\& my $p = \*(AqRDF::Trine::Parser\*(Aq;
\& $p\->parse_url_into_model($data\->uri, $model, context => $data\->uri);
\& $p\->parse_url_into_model($foaf\->uri, $model, context => $foaf\->uri);
\&
\& my $cl = RDF::Closure::Engine\->new(\*(Aqrdfs\*(Aq, $model);
\& $cl\->closure;
\&
\& my $filter = mk_filter(FLT_NONRDF|FLT_BORING, [$foaf]);
\& my $output = &sgrep($filter, $model\->as_stream);
\&
\& print RDF::Trine::Serializer
\& \->new(\*(AqRDFXML\*(Aq)
\& \->serialize_iterator_to_string($output);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This distribution is a pure Perl \s-1RDF\s0 inference engine designed as an add-in
for RDF::Trine. It is largely a port of Ivan Herman's Python RDFClosure
library, though there has been some restructuing, and there are a few extras
thrown in.
.PP
Where one of the Perl modules has a direct equivalent in Ivan's library,
this is noted in the \s-1POD.\s0
.SS "Functions"
.IX Subsection "Functions"
This package inherits from RDF::Trine and exports the same functions,
plus:
.IP "\(bu" 4
\&\f(CW\*(C`mk_filter($basic_filters, $ignore_contexts)\*(C'\fR
.Sp
Creates a filter (coderef) suitable for use with \f(CW\*(C`sgrep\*(C'\fR from
RDF::Trine::Iterator.
.Sp
\&\f(CW$basic_filters\fR is an integer which can be assembled by bitwise-OR-ing
the constants \f(CW\*(C`FLT_NONRDF\*(C'\fR and \f(CW\*(C`FLT_BORING\*(C'\fR.
.Sp
\&\f(CW$ignore_contexts\fR is an arrayref of RDF::Trine::Node objects, each
of which represents a context that should be filtered out.
.Sp
.Vb 2
\& use RDF::Trine::Iterator qw[sgrep];
\& use RDF::Closure qw[iri mk_filter FLT_NONRDF FLT_BORING];
\&
\& my $foaf = iri(\*(Aqhttp://xmlns.com/foaf/0.1/index.rdf\*(Aq);
\& my $filter = mk_filter(FLT_NONRDF|FLT_BORING, [$foaf]);
\&
\& my $remaining = &sgrep($filter, $model\->as_stream);
\&
\& # $remaining is now an iterator which will return all triples
\& # from $model except: those in the FOAF named graph, those which
\& # are non\-RDF (e.g. literal subject) and those which are boring.
.Ve
.Sp
Which triples are boring? Any triple of the form { ?x owl:sameAs ?x .},
{ ?x owl:equivalentProperty ?x .}, { ?x owl:equivalentClass ?x .},
{ ?x rdfs:subPropertyOf ?x .} or { ?x rdfs:subClassOf ?x .} is boring
(i.e. where these statements have the same term in subject and object
position). Any triple where the subject, predicate and object nodes are
all in the \s-1RDF, RDFS, OWL\s0 or \s-1XSD\s0 namespaces is boring. Other triples are
not boring.
.PP
For convenience, \f(CW\*(C`RDF::Closure\*(C'\fR also exports variables called \f(CW$RDF\fR,
\&\f(CW$RDFS\fR, \f(CW$OWL\fR and \f(CW$XSD\fR which are RDF::Trine::Namespace objects.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
RDF::Closure::Engine,
RDF::Closure::Model,
RDF::Trine::Parser::OwlFn.
.PP
RDF::Trine,
RDF::Query.
.PP
.
.PP
.
.SH "AUTHOR"
.IX Header "AUTHOR"
Toby Inkster .
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2011\-2012 Toby Inkster
.PP
This library is free software; you can redistribute it and/or modify it
under any of the following licences:
.IP "\(bu" 4
The Artistic License 1.0 .
.IP "\(bu" 4
The \s-1GNU\s0 General Public License Version 1 ,
or (at your option) any later version.
.IP "\(bu" 4
The W3C Software Notice and License .
.IP "\(bu" 4
The Clarified Artistic License .
.SH "DISCLAIMER OF WARRANTIES"
.IX Header "DISCLAIMER OF WARRANTIES"
\&\s-1THIS PACKAGE IS PROVIDED \*(L"AS IS\*(R" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.\s0