code: def make_article_info_footnotes_other(self, article_info_div):
          
          other_fn_expr = "./back/fn-group/fn[@fn-type='other']"
          other_fns = self.article.root.xpath(other_fn_expr)
          if other_fns:
              other_fn_div = etree.SubElement(article_info_div,
                                              'div',
                                              {'class': 'back-fn-other'})
          for other_fn in other_fns:
              append_all_below(other_fn_div, other_fn)
docs: This will catch all of the footnotes of type 'other' in the <fn-group>
          of the <back> element.