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<title>Declare namespaces: Raptor RDF Syntax Library Manual</title>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="tutorial-serializer-declare-namespace"></a>Declare namespaces</h2></div></div></div>
<p>Raptor can use namespace prefix/URIs to abbreviate syntax
in some syntaxes such as Turtle or any XML syntax including RDF/XML,
RSS1.0 and Atom 1.0. These are declared
with <a class="link" href="raptor2-section-serializer.html#raptor-serializer-set-namespace" title="raptor_serializer_set_namespace ()"><code class="function">raptor_serializer_set_namespace()</code></a>
using a prefix and URI argument pair like this:
</p>
<pre class="programlisting">
const unsigned char* prefix = "ex";
raptor_uri* uri = raptor_new_uri(world, "http://example.org");
raptor_serializer_set_namespace(rdf_serializer, prefix, uri);
</pre>
<p>
</p>
<p>or
<a class="link" href="raptor2-section-serializer.html#raptor-serializer-set-namespace-from-namespace" title="raptor_serializer_set_namespace_from_namespace ()"><code class="function">raptor_serializer_set_namespace_from_namespace()</code></a>
from an existing namespace. This can be useful when connected up the
the namespace declarations that are generated from a parser via a
namespace handler set with
<a class="link" href="raptor2-section-parser.html#raptor-parser-set-namespace-handler" title="raptor_parser_set_namespace_handler ()"><code class="function">raptor_parser_set_namespace_handler()</code></a>
</p>
like this:
<pre class="programlisting">
static void
relay_namespaces(void* user_data, raptor_namespace *nspace)
{
raptor_serializer_set_namespace_from_namespace(rdf_serializer, nspace);
}
...
rdf_parser = raptor_new_parser(world, syntax_name);
raptor_parser_set_namespace_handler(rdf_parser, rdf_serializer, relay_namespaces);
</pre>
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