RDFStore::Model - An implementation of the Model RDF API using tied hashes and implementing free-text search on literals

NAME

RDFStore::Model - An implementation of the Model RDF API using tied hashes and implementing free-text search on literals

SYNOPSIS

        use RDFStore::NodeFactory;
        my $factory= new RDFStore::NodeFactory();
        my $statement = $factory->createStatement(
                                $factory->createResource('http://perl.org'),
                                $factory->createResource('http://iscool.org/schema/1.0/','label'),
                                $factory->createLiteral('Cool Web site')
                                );
        my $statement1 = $factory->createStatement(
                                $factory->createResource("http://www.altavista.com";),
                                $factory->createResource("http://pen.jrc.it/schema/1.0/','author'),
                                $factory->createLiteral("Who? :-)")
                                );

        my $statement2 = $factory->createStatement(
                                $factory->createUniqueResource(),
                                $factory->createUniqueResource(),
                                $factory->createLiteral("")
                                );

        use RDFStore::Model;
        my $model = new RDFStore::Model( Name => 'store', FreeText => 1 );

        $model->add($statement);
        $model->add($statement1);
        $model->add($statement2);
        my $model1 = $model->duplicate();

        print $model1->getDigest->equals( $model1->getDigest );
        print $model1->getDigest->hashCode;

        my $found = $model->find($statement2->subject,undef,undef);
        my $found1 = $model->find(undef,undef,undef,undef,'Cool'); #free-text search on literals :)

        #get Statements
        foreach ( @{$found->elements} ) {
                print $_->getLabel(),"\n";
        };

        #or faster
        my $fetch;
        foreach ( @{$found->elements} ) {
                my $fetch=$_;  #avoid too many fetches from RDFStore::Model::Statements
                print $fetch->getLabel(),"\n";
        };

        #or
        my($statements)=$found1->elements;
        for ( 0..$#{$statements} ) {
                print $statements->[$_]->getLabel(),"\n";
        };

        #get RDFNodes
        foreach ( keys %{$found->elements}) {
                print $found->elements->{$_}->getLabel(),"\n";
        };

        # set operations
        my $set = new RDFStore::Model( Name => 'setmodel' );

        $set=$set->interset($other_model);
        $set=$set->unite($other_model);
        $set=$set->subtract($other_model);

DESCRIPTION

An RDFStore::Model implementation using RDFStore(3) to store triplets.

CONSTRUCTORS


The following methods construct/tie RDFStore::Model storages and objects:

$model = new RDFStore::Model( %whateveryoulikeit );


Create an new RDFStore::Model object and tie up the RDFStore(3). The %whateveryoulikeit hash contains a set of configuration options about how and where store actual data.

Possible additional options are the following:

Name


This is a label used to identify a B<Persistent> storage by name. It might correspond to a physical file system directory containing the indexes DBs. By default if no B<Name> option is given the storage is assumed to be B<in-memory> (e.g. RDFStore::Storage::find method return result sets as in-memory models by default unless specified differently). For local persistent storages a directory named liek this option is created in the current working directory with mode 0666)

Sync

Sync the RDFStore::Model with the underling Data::MagciTie GDS after each add() or remove().

FreeText

Enable free text searching on literals over a model (see find)

AUTHOR