diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 05:40:05 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 05:40:05 +0000 |
| commit | 4038ab95a094b363f1748f3dcb51511a1217475d (patch) | |
| tree | 7f393d66a783f91ddd263c78d681e485cf4f45ca /docs/html/tutorial-serializer-get-triples.html | |
| parent | Initial commit. (diff) | |
| download | raptor2-4038ab95a094b363f1748f3dcb51511a1217475d.tar.xz raptor2-4038ab95a094b363f1748f3dcb51511a1217475d.zip | |
Adding upstream version 2.0.16.upstream/2.0.16upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'docs/html/tutorial-serializer-get-triples.html')
| -rw-r--r-- | docs/html/tutorial-serializer-get-triples.html | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/docs/html/tutorial-serializer-get-triples.html b/docs/html/tutorial-serializer-get-triples.html new file mode 100644 index 0000000..b81d5ac --- /dev/null +++ b/docs/html/tutorial-serializer-get-triples.html @@ -0,0 +1,125 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> +<title>Get or construct RDF Statements (Triples): Raptor RDF Syntax Library Manual</title> +<meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"> +<link rel="home" href="index.html" title="Raptor RDF Syntax Library Manual"> +<link rel="up" href="tutorial-serializing.html" title="Serializing RDF triples to a syntax"> +<link rel="prev" href="tutorial-serializer-to-destination.html" title="Provide a destination for the serialized syntax"> +<link rel="next" href="tutorial-serializer-send-triples.html" title="Send RDF Triples to serializer"> +<meta name="generator" content="GTK-Doc V1.33.1 (XML mode)"> +<link rel="stylesheet" href="style.css" type="text/css"> +</head> +<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> +<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> +<td width="100%" align="left" class="shortcuts"></td> +<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> +<td><a accesskey="u" href="tutorial-serializing.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> +<td><a accesskey="p" href="tutorial-serializer-to-destination.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> +<td><a accesskey="n" href="tutorial-serializer-send-triples.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> +</tr></table> +<div class="section"> +<div class="titlepage"><div><div><h2 class="title" style="clear: both"> +<a name="tutorial-serializer-get-triples"></a>Get or construct RDF Statements (Triples)</h2></div></div></div> +<p> +An <a class="link" href="raptor2-section-triples.html#raptor-statement" title="raptor_statement"><span class="type">raptor_statement</span></a> +containing the triple terms and optional graph term +can be made either by receiving them from a +<a class="link" href="raptor2-section-parser.html#raptor-parser" title="raptor_parser"><span class="type">raptor_parser</span></a> +via parsing or can be constructed by hand.</p> +<p>When constructing by hand, +the <a class="link" href="raptor2-section-triples.html#raptor-statement" title="raptor_statement"><span class="type">raptor_statement</span></a> +structure should be allocated by the application and the fields +filled in. Each statement has three triple terms (subject, +predicate, object) and an optional graph term. The subject can be a +URI or blank node, the predicate can only be a URI and the object can +be a URI, blank node or RDF literal. RDF literals can have either +just a Unicode string, a Unicode string and a language or a Unicode +string and a datatype URI.</p> +<p>The statement terms are all instances of +<a class="link" href="raptor2-section-triples.html#raptor-term" title="raptor_term"><span class="type">raptor_term</span></a> +objects constructed with the appropriate constructor for +the URI, blank node or rdf literal types. The graph term +of the statement is typically a URI or blank node. +</p> +<div class="example"> +<a name="raptor-example-rdfserialize"></a><p class="title"><b>Example 3. <code class="filename">rdfserialize.c</code>: Serialize 1 triple to RDF/XML (Abbreviated)</b></p> +<div class="example-contents"> +<pre class="programlisting"> +#include <stdio.h> +#include <raptor2.h> +#include <stdlib.h> + +/* rdfserialize.c: serialize 1 triple to RDF/XML-Abbrev */ + +int +main(int argc, char *argv[]) +{ + raptor_world *world = NULL; + raptor_serializer* rdf_serializer = NULL; + unsigned char *uri_string; + raptor_uri *base_uri; + raptor_statement* triple; + + world = raptor_new_world(); + + uri_string = raptor_uri_filename_to_uri_string(argv[1]); + base_uri = raptor_new_uri(world, uri_string); + + rdf_serializer = raptor_new_serializer(world, "rdfxml-abbrev"); + raptor_serializer_start_to_file_handle(rdf_serializer, base_uri, stdout); + + /* Make a triple with URI subject, URI predicate, literal object */ + triple = raptor_new_statement(world); + triple->subject = raptor_new_term_from_uri_string(world, (const unsigned char*)"http://example.org/subject"); + triple->predicate = raptor_new_term_from_uri_string(world, (const unsigned char*)"http://example.org/predicate"); + triple->object = raptor_new_term_from_literal(world, + (const unsigned char*)"An example literal", + NULL, + (const unsigned char*)"en"); + + /* Write the triple */ + raptor_serializer_serialize_statement(rdf_serializer, triple); + + /* Delete the triple */ + raptor_free_statement(triple); + + raptor_serializer_serialize_end(rdf_serializer); + raptor_free_serializer(rdf_serializer); + + raptor_free_uri(base_uri); + raptor_free_memory(uri_string); + + raptor_free_world(world); + return 0; +} + +</pre> +<p>Compile it like this: +</p> +<pre class="screen"> +$ gcc -o rdfserialize rdfserialize.c `pkg-config raptor2 --cflags --libs` +</pre> +<p> +and run it with an optional base URI argument +</p> +<pre class="screen"> +$ ./rdfserialize +<?xml version="1.0" encoding="utf-8"?> +<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> + <rdf:Description rdf:about="http://example.org/subject"> + <ns0:predicate xmlns:ns0="http://example.org/" xml:lang="en">An example</ns0:predicate> + </rdf:Description> +</rdf:RDF> +</pre> +<p> +</p> +</div> +</div> +<br class="example-break"> +</div> +<div class="footer"> +<hr>Generated by GTK-Doc V1.33.1</div> +</body> +</html>
\ No newline at end of file |