How to use the mappyfile.tokens.SINGLETON_COMPOSITE_NAMES function in mappyfile

key_name = self.key_name(key_token)
        composite_dict = CaseInsensitiveOrderedDict(CaseInsensitiveOrderedDict)
        composite_dict["__type__"] = key_name

        if self.include_position:
            pd = self.create_position_dict(key_token, None)
            composite_dict["__position__"] = pd

        if self.include_comments:
            comments_dict = composite_dict["__comments__"] = OrderedDict()

        for d in attribute_dicts:
            keys = d.keys()
            if "__type__" in keys:
                k = d["__type__"]
                if k in SINGLETON_COMPOSITE_NAMES:
                    composite_dict[k] = d
                else:
                    plural_key = self.plural(k)
                    if plural_key not in composite_dict:
                        composite_dict[plural_key] = []

                    composite_dict[plural_key].append(d)
            else:
                #  simple attribute
                pos = d.pop("__position__")
                d.pop("__tokens__", None)  # tokens are no longer needed now we have the positions
                comments = d.pop("__comments__", None)

                key_name = self.get_single_key(d)

                if key_name == "config":