# File wfo/repo/pukiwiki.rb, line 26
  def self.find_stable_uri(page)
    tree = HTree(page)
    tree.traverse_element("{http://www.w3.org/1999/xhtml}a") {|e|
      href = e.get_attr('href')
      if href && /\?cmd=edit&/ =~ href
        return page.last_request_uri + href
      end
    }
    raise "edit page could not find : #{last_request_uri}"
  end