---
name: "libraptor2"
section: "3"
platform: "linux"
package: "raptor"
version: "2.0.16-9"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/libraptor2"
---

# libraptor2(3)

Raptor RDF syntax library 2.0

## NAME

libraptor2 - Raptor RDF syntax library 2.0

## SYNOPSIS

```
#include <raptor2.h>
world=raptor_new_world();
raptor_parser *p=raptor_new_parser(world,rdfxml);
raptor_set_statement_handler(p,NULL,print_triples);
raptor_uri *file_uri=raptor_new_uri(world,http://example.org/);
raptor_parser_parse_file(p,file_uri,base_uri);
raptor_parser_parse_uri(p,uri,NULL);
raptor_free_parser(p);
raptor_free_uri(file_uri);
raptor_free_world(world);
cc prog.c -o prog `pkg-config raptor2 --cflags` `pkg-config raptor2 --libs`
```

## DESCRIPTION

The *Raptor* library provides a high-level interface to a set of parsers and serializers that generate Resource Description Framework (RDF) triples by parsing syntaxes or serialize the triples into syntaxes.

The supported parsing syntaxes include RDF/XML, N-Triples, Turtle, TRiG, RSS tag soup (including all RSS and Atoms), GRDDL, RDF/JSON, RDFa and the serializing syntaxes include RDF/XML (3 varieties), N-Quads, N-Triples, Turtle, RSS 1.0, Atom 1.0, GraphViz DOT and RDF/JSON. The RDF/XML parser can use either *expat* or *libxml* XML parsers for providing the SAX event stream. The library functions are arranged in an object-oriented style with constructors, destructors and method calls.  The statements and error messages are delivered via callback functions.

Raptor also contains classes to support the RDF graph triples: a statement object containing term objects and support for RDF URI-References for both parsing them and resolving / retrieval of URIs.

It some utility classes such as an I/O Stream abstraction for supporting reading and writing to and from a variety of locations, AVL Trees, String buffers and Sequences.

Raptor uses Unicode strings for RDF literals and URIs and preserves them throughout the library.  It uses the UTF-8 encoding of Unicode at the API for passing in or returning Unicode strings.  It is intended that the preservation of Unicode for URIs supports Internationalized Resource Identifiers (IRIs).

## API REFERENCE

See the HTML API docs that may be installed system wide at /usr/share/gtk-doc/html/raptor2/ or on the web at http://librdf.org/raptor/api/ ⟨http://librdf.org/raptor/api/⟩

## API CHANGES

See the Raptor API docs changes section at http://librdf.org/raptor/api/raptor-changes.html  ⟨http://librdf.org/raptor/api/raptor-changes.html⟩ and the upgrading information when converting from libraptor(1) code at http://librdf.org/raptor/UPGRADING.html ⟨http://librdf.org/raptor/UPGRADING.html⟩\

## CONFORMING TO

*RDF/XML Syntax (Revised)*, Dave Beckett (ed.) W3C Recommendation, http://www.w3.org/TR/rdf-syntax-grammar/ ⟨http://www.w3.org/TR/rdf-syntax-grammar/⟩

*N-Triples*, in *RDF Test Cases*, Jan Grant and Dave Beckett (eds.) W3C Recommendation, http://www.w3.org/TR/rdf-testcases/#ntriples ⟨http://www.w3.org/TR/rdf-testcases/#ntriples⟩

*Turtle - Terse RDF Triple Language*, Dave Beckett, http://www.dajobe.org/2004/01/turtle/ ⟨http://www.dajobe.org/2004/01/turtle/⟩

*RSS 0.91 spec revision 3*, Dan Libby, Netscape, http://my.netscape.com/publish/formats/rss-spec-0.91.html ⟨http://my.netscape.com/publish/formats/rss-spec-0.91.html⟩

*RDF Site Summary (RSS) 1.0*, http://purl.org/rss/1.0/spec ⟨http://purl.org/rss/1.0/spec⟩

*Atom 1.0 syndication format*, RFC 4287, http://www.ietf.org/rfc/rfc4287.txt ⟨http://www.ietf.org/rfc/rfc4287.txt⟩

*Gleaning Resource Descriptions from Dialects of Languages* *(GRDDL)*, Dan Connolly (ed.), W3C Recommendation, 2007-09-11, http://www.w3.org/TR/2007/REC-grddl-20070911/ ⟨http://www.w3.org/TR/2007/REC-grddl-20070911/⟩

*RDFa in XHTML: Syntax and Processing*, Ben Adida, Mark Birbeck, Shane McCarron, Steven Pemberton (eds.)\
  W3C Recommendation, 2008-10-14, http://www.w3.org/TR/2008/REC-rdfa-syntax-20081014/ ⟨http://www.w3.org/TR/2008/REC-rdfa-syntax-20081014/⟩

## SEE ALSO

**[rapper(1)](/rapper/1.md)**

## AUTHOR

Dave Beckett -  http://www.dajobe.org/ ⟨http://www.dajobe.org/⟩