Reference

RDF::Trine::Store::LDF(3pm)

RDF Store proxy for a Linked Data Fragment endpoint

NAME

RDF::Trine::Store::LDF - RDF Store proxy for a Linked Data Fragment endpoint

SYNOPSIS

    use RDF::Trine::Store::LDF;
    use RDF::Trine::Store;
    my $store = RDF::Trine::Store->new_with_config({
            storetype => 'LDF',
            url => $url
    });
    my $it = $store->get_statements();
    while (my $st = $it->next) {
        # $st is a RDF::Trine::Statement
        print "$st\n";
    }
    # Or query the store with SPAQRL
    use RDF::Query;
    my $model =  RDF::Trine::Model->new($store);
    my $rdf_query = RDF::Query->new(<<EOF);
    .
    .
    SPARQL
    .
    .
    EOF
    my $iter = $rdf_query->execute($model);
    while (my $s = $iter->next) {
        # $s is a RDF::Trine::VariableBinding
        print $s->value . "\n";
    }

DESCRIPTION

RDF::Trine::Store::LDF provides a RDF::Trine::Store API to interact with a remote Linked Data Fragment endpoint. For details see: <http://linkeddatafragments.org/>.

METHODS

Beyond the methods documented below, this class inherits methods from the RDF::Trine::Store class.

new({ url => url })

Returns a new RDF::Trine::Store object that will act as a proxy for the Linked Data Fragment endpoint accessible via the supplied $url.

Expertimental: more than one url as an ARRAY reference can be provided for an federated query over many LDF endpoints.

new_with_config( $hashref )

Returns a new RDF::Trine::Store object configured by a hashref with the url as required key.

get_statements( $subject, $predicate, $object )

Returns a stream object of all statements matching the specified subject, predicate and objects. Any of the arguments may be undef to match any value.

get_pattern( $bgp )

Returns an iterator object of all bindings matching the specified graph pattern.

get_contexts

Not supported.

add_statement ( $statement [, $context] )

Not supported.

remove_statement ( $statement [, $context])

Not supported.

remove_statements ( $subject, $predicate, $object [, $context])

Not supported.

count_statements ( $subject, $predicate, $object )

Returns a count of all the statements matching the specified subject, predicate and object. Any of the arguments may be undef to match any value.

size

Returns the number of statements in the store.

supports ( [ $feature ] )

Not supported.

AUTHOR

Patrick Hochstenbach, "patrick.hochstenbach at ugent.be"

CONTRIBUTORS

Gregory Todd Williams, "[email protected]"

LICENSE

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See <http://dev.perl.org/licenses/> for more information.

History