# File wfo/missing.rb, line 70
    def base_uri
      return @base_uri if defined? @base_uri
      traverse_element('{http://www.w3.org/1999/xhtml}base') {|elem|
        base_uri = URI(elem.get_attr('href'))
        base_uri = @protocol_base_uri + base_uri if @protocol_base_uri
        @base_uri = base_uri
      }
      @base_uri = @request_uri unless defined? @base_uri
      return @base_uri
    end