NAME

       Catmandu::Importer::RDF - parse RDF data

SYNOPSIS

       Command line client "catmandu":

         catmandu convert RDF --url http://d-nb.info/gnd/4151473-7 to YAML

         catmandu convert RDF --file rdfdump.ttl to JSON

         # Query a SPARQL endpoint
         catmandu convert RDF --url http://dbpedia.org/sparql
                              --sparql "SELECT ?film WHERE { ?film dct:subject <http://dbpedia.org/resource/Category:French_films> }"

         catmandu convert RDF --url http://example.org/sparql --sparql query.rq

         # Query a Linked Data Fragment endpoint
         catmandu convert RDF --url http://fragments.dbpedia.org/2014/en
                              --sparql "SELECT ?film WHERE { ?film dct:subject <http://dbpedia.org/resource/Category:French_films> }"

       In Perl code:

           use Catmandu::Importer::RDF;
           my $url = "http://dx.doi.org/10.2474/trol.7.147";
           my $rdf = Catmandu::Importer::RDF->new( url => $url )->first;

DESCRIPTION

       This Catmandu::Importer can be use to import RDF data from URLs, files or input streams,
       SPARQL endpoints, and Linked Data Fragment endpoints.

       By default an RDF graph is imported as single item in aREF format (see RDF::aREF).

CONFIGURATION

       url URL to retrieve RDF from.

       type
           RDF serialization type (e.g. "ttl" for RDF/Turtle).

       base
           Base URL. By default derived from the URL or file name.

       ns  Use default namespace prefixes as provided by RDF::NS to abbreviate predicate and
           datatype URIs. Set to 0 to disable abbreviating URIs.  Set to a specific date to get
           stable namespace prefix mappings.

       triples
           Import each RDF triple as one aREF subject map (default) or predicate map (option
           "predicate_map"), if enabled.

       predicate_map
           Import RDF as aREF predicate map, if possible.

       file
       fh
       encoding
       fix Default configuration options of Catmandu::Importer.

       sparql
           The SPARQL query to be executed on the URL endpoint (currectly only SELECT is
           supported).  The query can be supplied as string or as filename. The importer tries to
           automatically add missing PREFIX statements from the default namespace prefixes.

       sparql_result
           Encoding of SPARQL result values. With "aref", query results are encoded in aREF
           format, with URIs in "<" and ">" (no qNames) and literal nodes appended by "@" and
           optional language code. By default (value "simple"), all RDF nodes are simplfied to
           their literal form.

METHODS

       See Catmandu::Importer.

SEE ALSO

       RDF::Trine::Store, RDF::Trine::Parser