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.IX Title "Catmandu::Importer::RDF 3pm"
.TH Catmandu::Importer::RDF 3pm "2022-12-06" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Catmandu::Importer::RDF \- parse RDF data
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
Command line client \f(CW\*(C`catmandu\*(C'\fR:
.PP
.Vb 1
\&  catmandu convert RDF \-\-url http://d\-nb.info/gnd/4151473\-7 to YAML
\&
\&  catmandu convert RDF \-\-file rdfdump.ttl to JSON
\&
\&  # Parse the input into on JSON document per triplet. This is the
\&  # most memory efficient (and fastest) way to parse RDF input.
\&  catmandu convert RDF \-\-triples 1 \-\-file rdfdump.ttl to JSON
\&
\&  # Transform back into NTriples (conversions to and from triples is the
\&  # most efficient way to process RDF)
\&  catmandu convert RDF \-\-triples 1 \-\-file rdfdump.ttl to RDF \-\-type NTriples
\&
\&  # 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> }"
.Ve
.PP
In Perl code:
.PP
.Vb 3
\&    use Catmandu::Importer::RDF;
\&    my $url = "http://dx.doi.org/10.2474/trol.7.147";
\&    my $rdf = Catmandu::Importer::RDF\->new( url => $url )\->first;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This Catmandu::Importer can be use to import \s-1RDF\s0 data from URLs, files or
input streams, \s-1SPARQL\s0 endpoints, and Linked Data Fragment endpoints.
.PP
By default an \s-1RDF\s0 graph is imported as single item in aREF format (see
RDF::aREF).
.SH "CONFIGURATION"
.IX Header "CONFIGURATION"
.IP "url" 4
.IX Item "url"
\&\s-1URL\s0 to retrieve \s-1RDF\s0 from.
.IP "type" 4
.IX Item "type"
\&\s-1RDF\s0 serialization type (e.g. \f(CW\*(C`ttl\*(C'\fR for RDF/Turtle).
.IP "base" 4
.IX Item "base"
Base \s-1URL.\s0 By default derived from the \s-1URL\s0 or file name.
.IP "ns" 4
.IX Item "ns"
Use default namespace prefixes as provided by \s-1RDF::NS\s0 to abbreviate
predicate and datatype URIs. Set to \f(CW0\fR to disable abbreviating URIs.
Set to a specific date to get stable namespace prefix mappings.
.IP "triples" 4
.IX Item "triples"
Import each \s-1RDF\s0 triple as one aREF subject map (default) or predicate map
(option \f(CW\*(C`predicate_map\*(C'\fR), if enabled. This is the most efficient way to
process large input files. All the processing can be streamed.
.IP "predicate_map" 4
.IX Item "predicate_map"
Import \s-1RDF\s0 as aREF predicate map, if possible.
.IP "file" 4
.IX Item "file"
.PD 0
.IP "fh" 4
.IX Item "fh"
.IP "encoding" 4
.IX Item "encoding"
.IP "fix" 4
.IX Item "fix"
.PD
Default configuration options of Catmandu::Importer.
.IP "sparql" 4
.IX Item "sparql"
The \s-1SPARQL\s0 query to be executed on the \s-1URL\s0 endpoint (currectly only \s-1SELECT\s0 is
supported).  The query can be supplied as string or as filename. The importer
tries to automatically add missing \s-1PREFIX\s0 statements from the default namespace
prefixes.
.IP "sparql_result" 4
.IX Item "sparql_result"
Encoding of \s-1SPARQL\s0 result values. With \f(CW\*(C`aref\*(C'\fR, query results are encoded in
aREF format, with URIs in \f(CW\*(C`<\*(C'\fR and \f(CW\*(C`>\*(C'\fR (no qNames) and literal nodes
appended by \f(CW\*(C`@\*(C'\fR and optional language code. By default (value \f(CW\*(C`simple\*(C'\fR), all
\&\s-1RDF\s0 nodes are simplfied to their literal form.
.IP "cache" 4
.IX Item "cache"
Set to a true value to cache repeated \s-1URL\s0 responses in a \s-1CHI\s0 based backend.
.IP "cache_options" 4
.IX Item "cache_options"
Provide the \s-1CHI\s0 based options for caching result sets. By default a memory store of
1MB size is used. This is equal to:
.Sp
.Vb 7
\&    Catamandu::Importer::RDF\->new( ...,
\&        cache => 1,
\&        cache_options => {
\&            driver => \*(AqMemory\*(Aq,
\&            global => 1,
\&            max_size => 1024*1024
\&        });
.Ve
.IP "speed" 4
.IX Item "speed"
If set to a true value, then write \s-1RDF\s0 file processing speed on the \s-1STDERR\s0 as
number of triples parsed per second.
.SH "METHODS"
.IX Header "METHODS"
See Catmandu::Importer.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
RDF::Trine::Store, RDF::Trine::Parser