code: def default_instruction_to_svg(self, instruction):
          
          svg_dict = self.default_instruction_to_svg_dict(instruction)
          return xmltodict.unparse(svg_dict)
docs: As :meth:`instruction_to_svg` but it only takes the ``default.svg``
          file into account.
  
          In case no file is found for an instruction in
          :meth:`instruction_to_svg`,
          this method is used to determine the default svg for it.
  
          The content is created by replacing the text ``{instruction.type}`` in
          the whole svg file named ``default.svg``.
  
          If no file ``default.svg`` was loaded, an empty string is returned.