NAME

RDF::aREF::Query - aREF query expression

SYNOPSIS

    my $rdf = {
        'http://example.org/book' => {
            dct_creator => [
                'http://example.org/alice', 
                'http://example.org/bob'
            ]
        },
        'http://example.org/alice' => {
            foaf_name => "Alice"
        },
        'http://example.org/bob' => {
            foaf_name => "Bob"
        }
    };

    my $getnames = RDF::aREF::Query->new( 
        query => 'dct_creator.foaf_name' 
    );
    my @names = $getnames->apply( $rdf, 'http://example.org/boo' );

DESCRIPTION

Implements aREF query, a query language to access strings and nodes from agiven RDF graph.

See also function aref_query in RDF::aREF.

CONFIGURATION

The constructor expects the following options:

query

aREF query expression

decoder

Instance of RDF::aREF::Decoder (a new instance is created unless given)

ns

Optional namespace map, passed to the constructor of RDF::aREF::Decoder. This option is ignored if option decoder was supplied.

METHODS

apply( $rdf [, $origin ] )

Perform the query on a given RDF graph. The origin node must be provided as string unless the RDF graph is provided as predicate map.