SIMPLE SOLUTIONS

RDF::AREF::QUERY - reference manual online

AREF query expression.

Chapter
2015-03-03
RDF::aREF::Query(3pm)          User Contributed Perl Documentation          RDF::aREF::Query(3pm)

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' ); $getnames->query; # 'dct_creator.foaf_name' use RDF::aREF qw(aref_query_map); my $record = aref_query_map( $rdf, $publication, { 'dct_creator@' => 'creator', 'dct_creator.foaf_name' => 'creator', });
DESCRIPTION Implements aREF query <http://gbv.github.io/aREF/aREF.html#aref-query>, a query language to access strings and nodes from agiven RDF graph. See also functions "aref_query" and "aref_query_map" in RDF::aREF for convenient application.
CONFIGURATION The constructor expects the following options: query aREF query <http://gbv.github.io/aREF/aREF.html#aref-query> expression decoder Instance of RDF::aREF::Decoder to map qNames to URIs. A new instance is created unless given. ns Optional namespace map (RDF::NS), passed to the constructor of RDF::aREF::Decoder if no decoder is given.
METHODS apply( $graph [, $origin ] ) Perform the query on a given RDF graph. The graph can be given as aREF structure (subject map or predicate map) or as instance of RDF::Trine::Model. An origin subject node must be provided unless the RDF graph is provided as predicate map <http://gbv.github.io/aREF/aREF.html#predicate-maps>.
query Returns the aREF query expression
SEE ALSO Use SPARQL for more complex queries, e.g. with RDF::Trine::Store::SPARQL.
perl v5.20.2 2015-03-03 RDF::aREF::Query(3pm)