NAME
    RDF::aREF - Another RDF Encoding Form

SYNOPSIS
        use RDF::aREF;

        my $rdf = {
          _id       => 'http://example.com/people#alice',
          foaf_name => 'Alice Smith',
          foaf_age  => '42^xsd_integer',
          foaf_homepage => [
             { 
               _id => 'http://personal.example.org/',
               dct_modified => '2010-05-29^xsd_date',
             },
            'http://work.example.com/asmith/',
          ],
          foaf_knows => {
            dct_description => 'a nice guy@en',
          },
        };

        decode_aref( $rdf,
            callback => sub {
                my ($subject, $predicate, $object, $language, $datatype) = @_;
                ...
            }
        );
    
        my @lastmod = aref_query $rdf, 'foaf_homepage.dct_modified^';

        my $model = RDF::Trine::Model->new;
        decode_aref( $rdf, callback => $model );
        print RDF::Trine::Serializer->new('Turtle')->serialize_model_to_string($model);

        my $model = RDF::Trine::Model->new;
        RDF::Trine::Parser->parse_url_into_model($url, $model);
        my $aref = encode_aref $model;

DESCRIPTION
    aREF (another RDF Encoding Form <http://gbv.github.io/aREF/>) is an
    encoding of RDF graphs in form of arrays, hashes, and Unicode strings.
    This module provides methods for decoding from aREF data to RDF triples
    (RDF::aREF::Decoder), for encoding RDF data in aREF
    (RDF::aREF::Encoder), and for querying parts of an RDF graph
    (RDF::aREF::Query).

EXPORTED FUNCTIONS
    The following functions are exported by default.

  decode_aref $aref [, %options ]
    Decodes an aREF document given as hash reference with
    RDF::aREF::Decoder. Equivalent to
    "RDF::aREF::Decoder->new(%options)->decode($aref)".

  encode_aref $graph [, %options ]
    Construct an aREF subject map (using a new RDF::aREF::Encoder) fron an
    RDF graph. The graph can be supplied as:

    *   instance of RDF::Trine::Model

    *   instance of RDF::Trine::Model::Iterator

    *   an URL (experimental and only if RDF::Trine is installed)

    *   instance of Attean::API::TripleIterator (experimental)

    *   instance of Attean::API::TripleStore (experimental)

    *   hash reference with RDF/JSON <http://www.w3.org/TR/rdf-json/> format
        (as returned by method "as_hashref" in RDF::Trine::Model)

  aref_query $graph, [ $origin ], @queries
    Query parts of an aREF data structure by aREF query expressions
    <http://gbv.github.io/aREF/aREF.html#aref-query> and return a list. See
    RDF::aREF::Query for details.

  aref_query_map( $graph, [ $origin ], $query_map )
    Map parts of an aREF data structure to a flat key-value structure.

SEE ALSO
    *   aREF is specified at <http://github.com/gbv/aREF>.

    *   See Catmandu::RDF for an application of this module.

    *   Usee RDF::Trine for more elaborated handling of RDF data in Perl.

    *   See RDF::YAML for a similar (outdated) RDF encoding in YAML.

COPYRIGHT AND LICENSE
    Copyright Jakob Voss, 2014-

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.