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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="raptor-section-parser.html#raptor-set-default-generate-id-parameters" title="raptor_set_default_generate_id_parameters ()"><code class="function">raptor_set_default_generate_id_parameters()</code></a>
to adjust the default algorithm for generated identifiers.
</p>
<p>It is used as follows
</p>
<pre class="programlisting">
raptor_generate_id_handler id_handler;
raptor_set_generate_id_handler(rdf_parser, user_data, id_handler);
</pre>
<p>
</p>
<p>The <span class="emphasis"><em>id_handler</em></span> takes the following signature:
</p>
<pre class="programlisting">
unsigned char*
generate_id_handler(void* user_data, raptor_genid_type type,
unsigned char* user_id) {
/* return a new generated ID based on user_id (optional) */
}
</pre>
<p>
where the
<a class="link" href="raptor-section-triples.html#raptor-genid-type" title="enum raptor_genid_type"><span class="type">raptor_genid_type</span></a>
provides extra information on the identifier being created and
<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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