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122 lines
4.9 KiB
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<title>Serializing example code</title>
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<link rel="start" href="index.html" title="Raptor RDF Syntax Parsing and Serializing Library Manual">
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<link rel="part" href="tutorial.html" title="Part I. Raptor Tutorial">
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<link rel="chapter" href="tutorial-initialising-finishing.html" title="Initialising and Finishing using the Library">
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<link rel="chapter" href="tutorial-querying-functionality.html" title="Listing built-in functionality">
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<link rel="chapter" href="tutorial-parsing.html" title="Parsing syntaxes to RDF Triples">
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<link rel="chapter" href="tutorial-serializing.html" title="Serializing RDF triples to a syntax">
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<link rel="chapter" href="raptor-serializers.html" title="Serializers in Raptor (triples to syntax)">
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="tutorial-serializer-example"></a>Serializing example code</h2></div></div></div>
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<div class="example">
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<a name="raptor-example-rdfcat"></a><p class="title"><b>Example 4. <code class="filename">rdfcat.c</code>: Read any RDF syntax and serialize to RDF/XML (Abbreviated)</b></p>
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<div class="example-contents">
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<pre class="programlisting">
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#include <stdio.h>
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#include <raptor.h>
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/* rdfcat.c: parse any RDF syntax and serialize to RDF/XML-Abbrev */
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static raptor_serializer* rdf_serializer;
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void
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serialize_triple(void* user_data, const raptor_statement* triple)
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{
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raptor_serialize_statement(rdf_serializer, triple);
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}
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static void
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declare_namespace(void* user_data, raptor_namespace *nspace)
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{
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raptor_serialize_set_namespace_from_namespace(rdf_serializer, nspace);
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}
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int
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main(int argc, char *argv[])
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{
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raptor_parser* rdf_parser=NULL;
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unsigned char *uri_string;
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raptor_uri *uri, *base_uri;
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raptor_init();
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uri_string=raptor_uri_filename_to_uri_string(argv[1]);
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uri=raptor_new_uri(uri_string);
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base_uri=raptor_uri_copy(uri);
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/* Ask raptor to work out which parser to use */
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rdf_parser=raptor_new_parser("guess");
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raptor_set_statement_handler(rdf_parser, NULL, serialize_triple);
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raptor_set_namespace_handler(rdf_parser, NULL, declare_namespace);
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rdf_serializer=raptor_new_serializer("rdfxml-abbrev");
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raptor_serialize_start_to_file_handle(rdf_serializer, base_uri, stdout);
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raptor_parse_file(rdf_parser, uri, base_uri);
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raptor_serialize_end(rdf_serializer);
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raptor_free_serializer(rdf_serializer);
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raptor_free_parser(rdf_parser);
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raptor_free_uri(base_uri);
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raptor_free_uri(uri);
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raptor_free_memory(uri_string);
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raptor_finish();
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}
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</pre>
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<p>Compile it like this:
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</p>
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<pre class="screen">
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$ gcc -o rdfcat rdfcat.c `raptor-config --cflags` `raptor-config --libs`
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</pre>
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<p>
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and run it on an RDF file as:
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</p>
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<pre class="screen">
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$ ./rdfcat raptor.rdf
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<?xml version="1.0" encoding="utf-8"?>
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<rdf:RDF xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://usefulinc.com/ns/doap#">
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<rdf:Description rdf:about="">
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<foaf:maker>
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<foaf:Person>
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<foaf:name>Dave Beckett</foaf:name>
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...
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</pre>
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<p>
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</p>
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</div>
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</div>
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<br class="example-break">
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</div>
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