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Redland Raptor RDF syntax library
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<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Raptor RDF Syntax Library</title> <link rel="meta" type="application/rdf+xml" title="DOAP" href="raptor.rdf" /> </head> <body> <h1 style="text-align:center">Raptor RDF Syntax Library</h1> <h2 style="text-align:center"><a href="http://www.dajobe.org/">Dave Beckett</a></h2> <h2>Overview</h2> <p><a href="http://librdf.org/raptor/">Raptor</a> is a free software / Open Source C library that provides a set of parsers and serializers that generate Resource Description Framework (RDF) triples by parsing syntaxes or serialize the triples into a syntax. The supported parsing syntaxes are RDF/XML, N-Quads, N-Triples, TRiG, Turtle, RDFa 1.0 and 1.1, RSS tag soup including all versions of RSS, Atom 1.0 and 0.3, GRDDL and microformats for HTML, XHTML and XML. The serializing syntaxes are RDF/XML (regular, and abbreviated), Atom 1.0, GraphViz, JSON, N-Quads, N-Triples, RSS 1.0 and XMP. </p> <p>Raptor was designed to work closely with the <a href="http://librdf.org/">Redland RDF library</a> (<b>R</b>DF <b>P</b>arser <b>T</b>oolkit f<b>o</b>r <b>R</b>edland) but is entirely separate. It is a portable library that works across many POSIX systems (Unix, GNU/Linux, BSDs, OSX, cygwin, win32). </p> <p>A summary of the changes can be found in the <a href="NEWS.html">NEWS</a> file, detailed API changes in the <a href="RELEASE.html">release notes</a> and file-by-file changes in the <a href="ChangeLog">ChangeLog</a>. </p> <p>Details of upgrading from Raptor 1 as described in the <a href="UPGRADING.html">Upgrading document</a>. </p> <ul> <li>Designed to integrate well with <a href="http://librdf.org/">Redland</a></li> <li>Parses content on the web if <a href="http://curl.haxx.se/libcurl/">libcurl</a>, <a href="http://xmlsoft.org/">libxml2</a> or BSD libfetch is available.</li> <li>Supports all RDF terms including datatyped and XML literals</li> <li>Optional features including parsers and serialisers can be selected at configure time.</li> <li>Language bindings to Perl, PHP, Python and Ruby when used via Redland</li> <li>No memory leaks</li> <li>Fast</li> <li>Standalone <a href="rapper.html">rapper</a> RDF parser utility program</li> </ul> <p>Known bugs and issues are recorded in the <a href="http://bugs.librdf.org/">Redland issue tracker</a>. </p> <h2>Parsers</h2> <h3>RDF/XML Parser</h3> <p>A Parser for the standard <a href="http://www.w3.org/TR/rdf-syntax-grammar/">RDF/XML syntax</a>. </p> <ul> <li>Fully handles the <a href="http://www.w3.org/TR/rdf-syntax-grammar/">RDF/XML syntax updates</a> for <a href="http://www.w3.org/TR/xmlbase/">XML Base</a>, <code>xml:lang</code>, RDF datatyping and Collections.</li> <li>Handles all RDF vocabularies such as <a href="http://www.foaf-project.org/">FOAF</a>, <a href="http://www.purl.org/rss/1.0/">RSS 1.0</a>, <a href="http://dublincore.org/">Dublin Core</a>, <a href="http://www.w3.org/TR/owl-features/">OWL</a>, <a href="http://usefulinc.com/doap">DOAP</a></li> <li>Handles <code>rdf:resource</code> / <code>resource</code> attributes</li> <li>Uses <a href="http://xmlsoft.org/">libxml</a> XML parser</li> </ul> <h3>N-Quads Parser</h3> <p>A parser for the <a href="http://sw.deri.org/2008/07/n-quads/">N-Quads</a> extension to N-Triples, providing an optional 4th context graph term at the end of the line when a triple is associated with a named graph. </p> <h3>N-Triples Parser</h3> <p>A parser for the <a href="http://www.w3.org/TR/2013/NOTE-n-triples-20130409/">N-Triples - A line-based syntax for an RDF graph</a> W3C Working Group Note 09 April 2013 (N-Triples 2013) based on the older <a href="http://www.w3.org/TR/rdf-testcases/#ntriples">N-Triples</a>. </p> <h3>Turtle Parser</h3> <p>A parser for the <a href="http://www.w3.org/TR/2013/CR-turtle-20130219/">Turtle Terse RDF Triple Language</a> W3C Candidate Recommendation 19 February 2013 based on earlier work <a href="http://www.dajobe.org/2004/01/turtle/">Turtle Terse RDF Triple Language</a> (2004) </p> <h3>TRiG Parser</h3> <p>A parser for the <a href="http://www.wiwiss.fu-berlin.de/suhl/bizer/TriG/Spec/">TriG - Turtle with Named Graphs</a> syntax; part of the Turtle parser code. </p> <p>The parser is alpha quality and may not support the entire TRiG specification. </p> <h3>RSS "tag soup" parser</h3> <p>A parser for the multiple XML RSS formats that use the elements such as channel, item, title, description in different ways. Attempts to turn the input into <a href="http://www.purl.org/rss/1.0/">RSS 1.0</a> RDF triples. True <a href="http://www.purl.org/rss/1.0/">RSS 1.0</a>, as a full RDF vocabulary, is best parsed by the RDF/XML parser. It also generates triples for RSS enclosures. </p> <p>This parser also provides support for the Atom 1.0 syndication format defined in IETF <a href="http://www.ietf.org/rfc/rfc4287.txt">RFC 4287</a> </p> <h3>GRDDL and microformats parser</h3> <p>A parser/processor for <a href="http://www.w3.org/TR/2007/REC-grddl-20070911/">Gleaning Resource Descriptions from Dialects of Languages (GRDDL)</a> syntax, W3C Recommendation of 2007-09-11 which allows reading XHTML and XML as RDF triples by using profiles in the document that declare XSLT transforms from the XHTML or XML content into RDF/XML or other RDF syntax which can then be parsed. It uses either an XML or a lax HTML parser to allow HTML tag soup to be read. </p> <p>The parser passes the all the GRDDL tests as of Raptor 1.4.16. </p> <p>The parser also handles hCard and hReview using public XSL sheets. </p> <h3>RDFa parser</h3> <p>A parser for <a href="http://www.w3.org/TR/2008/REC-rdfa-syntax-20081014/">RDFa 1.0</a> (W3C Recommendation 14 October 2008) and <a href="http://www.w3.org/TR/2012/REC-rdfa-core-20120607/">RDFa 1.1</a> (W3C Recommendation 07 June 2012) implemented via <a href="https://github.com/rdfa/librdfa">librdfa</a> linked inside Raptor. librdfa was, written primarily by Manu Sporny of Digital Bazaar and is licensed with the same license as Raptor. </p> <p>As of Raptor 2.0.8 the RDFa parser passes all of the <a href="http://www.w3.org/2006/07/SWD/RDFa/testsuite/xhtml1-testcases/">RDFa 1.0 test suite</a> except for 4 tests and all of the <a href="http://rdfa.info/dev/">RDFa 1.1 test suite</a> except for 30 tests. </p> <h2>Serializers</h2> <h3>RDF/XML Serializer</h3> <p>A serializer to the standard <a href="http://www.w3.org/TR/rdf-syntax-grammar/">RDF/XML syntax</a> as revised by the <a href="http://www.w3.org/2001/sw/RDFCore/">W3C RDF Core working group</a> in 2004. This writes a plain triple-based RDF/XML serialization with no optimisation or pretty-printing. </p> <p>A second serializer is provided using several of the RDF/XML abbreviations to provide a more compact readable format, at the cost of some pre-processing. This is suitable for small documents. </p> <h3>N-Quads Serializer</h3> <p>A serializer to the <a href="http://sw.deri.org/2008/07/n-quads/">N-Quads</a> extension to N-Triples, providing an optional 4th context graph term at the end of the line when a triple is associated with a named graph. </p> <h3>N-Triples Serializer</h3> <p>A serializer to the <a href="http://www.w3.org/TR/rdf-testcases/#ntriples">N-Triples</a> syntax as used by the <a href="http://www.w3.org/2001/sw/RDFCore/">W3C RDF Core working group</a> for the <a href="http://www.w3.org/TR/rdf-testcases/">RDF Test Cases</a>. </p> <h3>Atom 1.0 Serializer</h3> <p>A serializer to the Atom 1.0 syndication format defined in IETF <a href="http://www.ietf.org/rfc/rfc4287.txt">RFC 4287</a>. </p> <h3>JSON Serializers</h3> <p>Two serializers for to write triples encoded in JSON, one (<code>json</code>) in a resource-centric abbreviated form <a href="http://n2.talis.com/wiki/RDF_JSON_Specification">RDF/JSON</a> like Turtle or RDF/XML-Abbreviated; the other a triple-centric format (<code>json-triples</code>) based on the SPARQL results in JSON format. </p> <h3>GraphViz DOT Serializer</h3> <p>An serializer to the GraphViz <a href="http://www.graphviz.org/doc/info/lang.html">DOT format</a> which aids visualising RDF graphs. </p> <h3>RSS 1.0 Serializer</h3> <p>A serializer to the <a href="http://purl.org/rss/1.0/spec">RDF Site Summary (RSS) 1.0</a> format. </p> <h3>Turtle Serializer</h3> <p>A serializer for the <a href="http://www.dajobe.org/2004/01/turtle/">Turtle Terse RDF Triple Language</a> syntax. </p> <h3>XMP Serializer</h3> <p>An alpha quality serializer to the Adobe XMP profile of RDF/XML suitable for embedding inside an external document. </p> <h2>Documentation</h2> <p>The public API is described in the <a href="libraptor.html">libraptor.3</a> UNIX manual page. It is demonstrated in the <a href="rapper.html">rapper</a> utility program which shows how to call the parser and write the triples in a serialization. When Raptor is used inside <a href="http://librdf.org/">Redland</a>, the Redland documentation explains how to call the parser and contains several example programs. There are also further examples in the <tt>example</tt> directory of the distribution. </p> <p>To install Raptor see the <a href="INSTALL.html">Installation document</a>. </p> <h2>Sources</h2> <p>The packaged sources are available from <a href="http://download.librdf.org/source/">http://download.librdf.org/source/</a> (master site) and also from the <a href="http://sourceforge.net/projects/librdf/">SourceForge site</a>. The development GIT sources can also be <a href="http://github.com/dajobe/raptor">browsed at GitHub</a> or checked out at git://github.com/dajobe/raptor.git </p> <h2>License</h2> <p>This library is free software / open source software released under the LGPL (GPL) or Apache 2.0 licenses. See <a href="LICENSE.html">LICENSE.html</a> for full details. </p> <h2>Mailing Lists</h2> <p>The <a href="http://librdf.org/lists/">Redland mailing lists</a> discusses the development and use of Raptor and Redland as well as future plans and announcement of releases. </p> <hr /> <p>Copyright (C) 2000-2013 <a href="http://www.dajobe.org/">Dave Beckett</a><br />Copyright (C) 2000-2005 <a href="http://www.bristol.ac.uk/">University of Bristol</a></p> </body> </html>
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