Name: Anonymous 2013-04-05 7:18
and changed round brackets for curly brackets
<defun name="factorial" args="n">
<if>
<equal>
<constant value="1" />
<arg name="n" />
</equal>
<constant value="1" />
<factorial>
<subtract>
<arg name="n" />
<constant value="1" />
</subtract>
</factorial>
</if>
</defun>