def _navigation_list(self, node=None):
"""
Return an html representation of the table of contents for
this document. This is done recursively adding on a list item
for each element in the tree, and an unordered list if this
node has children. I might want to double check that this html
is the correct way to nest lists.
"""
if node is None:
self._construct_section_tree()
return self._navigation_list(self._section_tree)
result = ""
if 'title' in node.value and 'id' in node.value:
result += '<li>%s</li>' % node.value.url()
if len(node) > 0:
result += "<ul>%s</ul>" % \
"\n".join([self._navigation_list(child) for child in node])
return result
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