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<title>Set the identifier creator handler: Raptor RDF Syntax Library Manual</title>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="tutorial-parser-set-id-handler"></a>Set the identifier creator handler</h2></div></div></div>
<p>Identifiers are created in some parsers by generating them
automatically or via hints given a syntax. Raptor can customise this
process using a user-supplied identifier handler function.
For example, in RDF/XML generated blank node identifiers and those
those specified <code class="literal">rdf:nodeID</code> are passed through this
process. Setting a handler allows the identifier generation mechanism to be
fully replaced. A lighter alternative is to use
<a class="link" href="raptor2-section-world.html#raptor-world-set-generate-bnodeid-parameters" title="raptor_world_set_generate_bnodeid_parameters ()"><code class="function">raptor_world_set_generate_bnodeid_parameters()</code></a>
to adjust the default algorithm for generated identifiers.
</p>
<p>It is used as follows
</p>
<pre class="programlisting">
raptor_generate_bnodeid_handler bnodeid_handler;
raptor_world_set_generate_bnodeid_handler(rdf_parser, user_data, bnodeid_handler);
</pre>
<p>
</p>
<p>The <span class="emphasis"><em>bnodeid_handler</em></span> takes the following signature:
</p>
<pre class="programlisting">
unsigned char*
generate_id_handler(void* user_data, unsigned char* user_id)
{
/* return a new generated ID based on user_id (optional) */
}
</pre>
<p>
where <span class="emphasis"><em>user_id</em></span> an optional user-supplied identifier,
such as the value of a <code class="literal">rdf:nodeID</code> in RDF/XML.
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