code: def load(parser, serializer):
      
      fortdir = os.path.dirname(fortpy.__file__)
      xmlpath = os.path.join(fortdir, "isense", "builtin.xml")
      if not os.path.isfile(xmlpath):
          return {}
  
      changed_time = os.path.getmtime(xmlpath)
      cached = serializer.load_module("builtin.xml", changed_time)
      if cached is None:
          result = _load_builtin_xml(xmlpath, parser)
          serializer.save_module("builtin.xml", result, changed_time)
      else:
          result = cached
  
      return result
docs: Returns a dictionary of builtin functions for Fortran. Checks the
      cache first to see if we have a serialized version. If we don't, it
      loads it from the XML file.
  
      :arg parser: the DocParser instance for parsing the XML tags.
      :arg serializer: a Serializer instance from the CodeParser to cache
        the loaded XML file.