>canonical</span></tt>. Otherwise it will be
set to <tt class="docutils literal"><span class="pre">free</span></tt>.</dd>
</dl>
</div>
<div class="section" id="example">
<h1><a class="toc-backref" href="#id4">Example</a></h1>
<p>This example demonstrates using BGL-GraphML interface to write
a BGL graph into a GraphML format file.</p>
<pre class="literal-block">
enum files_e { dax_h, yow_h, boz_h, zow_h, foo_cpp,
               foo_o, bar_cpp, bar_o, libfoobar_a,
               zig_cpp, zig_o, zag_cpp, zag_o