NAME

    AtteanX::Store::LDF - Linked Data Fragment RDF store

SYNOPSIS

        use v5.14;
        use Attean;
        use Attean::RDF qw(iri blank literal);
        use AtteanX::Store::LDF;
    
        my $uri   = 'http://fragments.dbpedia.org/2014/en';
        my $store = Attean->get_store('LDF')->new(start_url => $uri);
    
        my $iter = $store->get_triples(undef,undef,literal("Albert Einstein"));
    
        while (my $triple = $iter->next) {
         say $triple->subject->ntriples_string .
           " " .
           $triple->predicate->ntriples_string . 
           " " .
           $triple->object->ntriples_string  .
           " .";
        }

DESCRIPTION

    AtteanX::Store::LDF provides a triple-store connected to a Linked Data
    Fragment server. For more information on Triple Pattern Fragments
    consult http://linkeddatafragments.org/

METHODS

    Beyond the methods documented below, this class inherits methods from
    the Attean::API::TripleStore class.

    new( start_url => $start_url )

      Returns a new LDF-backed storage object. The required start_url
      argument is a URL pointing at any Linked Data Fragment. The attribure
      will be coerced, so it can be a string, a URI object, etc.

    count_triples_estimate( $subject, $predicate, $object )

      Return the count of triples matching the specified subject, predicate
      and objects.

    get_triples( $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.

    cost_for_plan($plan)

      Returns an cost estimation for a single LDF triple based on
      estimates. The cost will be in the interval 10-1000 if the supplied
      argument is a AtteanX::Store::LDF::Plan::Triple, undef otherwise.

SEE ALSO

    Attean , Attean::API::TripleStore

BUGS

    Please report any bugs or feature requests to through the GitHub web
    interface at https://github.com/phochste/AtteanX-Store-LDF.

AUTHOR

    Patrick Hochstenbach <patrick.hochstenbach@ugent.be> Kjetil Kjernsmo
    <kjetilk@cpan.org>.

COPYRIGHT

    This software is copyright (c) 2015 by Patrick Hochstenbach. This
    software is copyright (c) 2016 by Patrick Hochstenbach and Kjetil
    Kjernsmo. This is free software; you can redistribute it and/or modify
    it under the same terms as the Perl 5 programming language system
    itself.

