---
name: "Catmandu::Exporter::RDF"
section: "3pm"
platform: "linux"
package: "libcatmandu-rdf-perl"
version: "0.32-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Catmandu::Exporter::RDF"
---

# Catmandu::Exporter::RDF(3pm)

serialize RDF data

## NAME

Catmandu::Exporter::RDF - serialize RDF data

## SYNOPSIS

In Perl code:

```
    use Catmandu -all;
    my $exporter = exporter('RDF',
        file => 'export.rdf',
        type => 'XML',
        fix  => 'rdf.fix'
    );
    $exporter->add( $aref ); # pass RDF data in aREF encoding
    $exporter->commit;
```

## DESCRIPTION

This Catmandu::Exporter exports RDF data in different RDF serializations.

## CONFIGURATION

- file

  - fh

  - encoding

  - fix

  Default configuration options of Catmandu::Exporter.  The option `"fix"` is supported as derived from Catmandu::Fixable. For every `"add"` or for every item in `"add_many"` the given fixes will be applied first.

- type

  A serialization form can be set with option `"type"` with default value `"NTriples"`. The option must refer to a subclass of RDF::Trine::Serializer, for instance `"Turtle"` for RDF/Turtle with RDF::Trine::Serializer::Turtle. The first letter is transformed uppercase, so `"format => 'turtle'"` will work as well. In addition there are aliases `"ttl"` for `"Turtle"`, `"n3"` for `"Notation3"`, `"xml"` and `"XML"` for `"RDFXML"`, `"json"` for `"RDFJSON"`.

  When the option `"type"` is set to 'NTriples' the export can be streamed in all  other cases the results are exported in bulk after `"commit()"`.

- ns

  The option `"ns"` can refer to an instance of or to a constructor argument of RDF::NS. Use a fixed date, such as "`20130816`" to make sure your URI namespace prefixes are stable.

## METHODS

See also Catmandu::Exporter.

### add( ... )

RDF data is added given in **another RDF Encoding Form (aREF)** as  implemented with RDF::aREF and defined at \<http://github.com/gbv/aref\>.

### count

Returns the number of times `"add"` has been called. In contrast to other Catmandu exporters, this does not reflect the number of exporter records because RDF data is always merged to one RDF graph.

### uri( $uri )

Expand and abbreviated with RDF::NS. For instance "`"dc:title"`" is expanded to "`"http://purl.org/dc/elements/1.1/title"`".

## SEE ALSO

Serialization is based on RDF::Trine::Serializer.