his function
will return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if <em class="parameter"><code>version</code></em> isn't valid. See <a class="link" href="cairo-PDF-Surfaces.html#cairo-pdf-get-versions" title="cairo_pdf_get_versions ()"><code class="function">cairo_pdf_get_versions()</code></a>
for a way to get the list of valid version ids.
</p>
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