def single(self, *queries):
        """
        Method performs a a single keyword search for a given list
        of keywords.
        """
        if len(queries) > 500:
            raise ApiError("Single keyword search is limited to "
                           "500 queries at a time")

        dom = parse(
            self._request("KeywordSingle", {"ApiKey": self.apikey,
                                            "Query": ",".join(queries)}))
        if self._validate(dom):
            return sorted(map(Keyword, dom.getElementsByTagName("Keyword")))

        Method performs a a single keyword search for a given list
        of keywords.
        
recipes/Python/577018_Wordzecom_API_bindings/recipe-577018.py