return ''
@register.simple_tag
-def book_tree_texml(book_list, books_by_parent, depth=0):
+def book_tree_texml(book_list, books_by_parent, depth=1):
return "".join("""
<cmd name='hspace'><parm>%(depth)dem</parm></cmd>%(title)s
<spec cat='align' /><cmd name="note"><parm>%(audiobook)s</parm></cmd>