NAME

RDFStore::Statement - An RDF Statement implementation

SYNOPSIS

        use RDFStore::Statement;
        use RDFStore::Literal;
        use RDFStore::Resource;
        my $statement = new RDFStore::Statement(
                                new RDFStore::Resource("http://www.w3.org/Home/Lassila"),
                                new RDFStore::Resource("http://description.org/schema/","Creator"),
                                new RDFStore::Literal("Ora Lassila") );
        my $statement1 = new RDFStore::Statement(
                                new RDFStore::Resource("http://www.w3.org"),
                                new RDFStore::Resource("http://description.org/schema/","Publisher"),
                                new RDFStore::Literal("World Wide Web Consortium") );

        my $subject = $statement->subject;
        my $predicate = $statement->predicate;
        my $object = $statement->object;

        print $statement->toString." is ";
        print "not"
                unless $statement->equals($statement1);
        print " equal to ".$statement1->toString."\n";

DESCRIPTION

An RDF Statement implementation.

METHODS

new ( SUBJECT, PREDICATE, OBJECT )

This is a class method, the constructor for RDFStore::Statement. SUBJECT and PREDICATE must be two RDFStore::Resource while OBJECT is RDFStore::RDFNode

subject

Return the RDFStore::Resource that is the RDF Subject/Resource of the Statement

predicate

Return the RDFStore::Resource that is the RDF Predicate/Property of the Statement/Resource

object

Return the RDFStore::RDFNode that is the RDF Object/Property-Value of the Statement/Resource

getURI

Return the URI identifing the RDF Statement; this is useful either for RDF reification (if ever it will be used :) and to treat RDF Statement as resources and then make "composite" statements....somehow ;)

getNamespace

Return undef

getLocalName

Return the label of the RDF Statement as a URN identifier with the digest hex encoded i.e. "urn:rdf:SHA-1:12uf2229829289229eee"

getLabel

Return the label of the RDF Statement as a URN identifier with the digest hex encoded i.e. "urn:rdf:SHA-1:12uf2229829289229eee"

toString

Return the textual represention of the RDF Statement i.e. triple("http://blaa.org", "http://purl.org/dc/elements/1.1/title", "Crapy site")

getDigest

Return a Cryptographic Digest (SHA-1 by default) of the Statement as defined in http://nestroy.wi-inf.uni-essen.de/rdf/sum_rdf_api/#K31

equals

Compare two RDF Statements.

SEE ALSO

RDFStore::Literal(3) RDFStore::Resource(3) RDFStore(3) RDFStore::Digest::Digestable(3) RDFStore::RDFNode(3)

ABOUT RDF

 http://www.w3.org/TR/rdf-primer/

 http://www.w3.org/TR/rdf-mt

 http://www.w3.org/TR/rdf-syntax-grammar/

 http://www.w3.org/TR/rdf-schema/

 http://www.w3.org/TR/1999/REC-rdf-syntax-19990222 (obsolete)

AUTHOR

        Alberto Reggiori <areggiori@webweaving.org>