def geocode(
            self,
            query,
            bbox=None,
            mapview=None,
            exactly_one=True,
            maxresults=None,
            pageinformation=None,
            language=None,
            additional_data=False,
            timeout=DEFAULT_SENTINEL
    ):
        """
        Return a location point by address.

        This implementation supports only a subset of all available parameters.
        A list of all parameters of the pure REST API is available here:
        https://developer.here.com/documentation/geocoder/topics/resource-geocode.html

        :param str query: The address or query you wish to geocode.

            For a structured query, provide a dictionary whose keys
            are one of: `city`, `county`, `district`, `country`, `state`,
            `street`, `housenumber`, or `postalcode`.

        :param bbox: A type of spatial filter, limits the search for any other attributes
            in the request. Specified by two coordinate (lat/lon)
            pairs -- corners of the box. `The bbox search is currently similar
            to mapview but it is not extended` (cited from the REST API docs).
            Relevant global results are also returned.
            Example: ``[Point(22, 180), Point(-22, -180)]``.
        :type bbox: list or tuple of 2 items of :class:`geopy.point.Point` or
            ``(latitude, longitude)`` or ``"%(latitude)s, %(longitude)s"``.

        :param mapview: The app's viewport, given as two coordinate pairs, specified
            by two lat/lon pairs -- corners of the bounding box,
            respectively. Matches from within the set map view plus an extended area
            are ranked highest. Relevant global results are also returned.
            Example: ``[Point(22, 180), Point(-22, -180)]``.
        :type mapview: list or tuple of 2 items of :class:`geopy.point.Point` or
            ``(latitude, longitude)`` or ``"%(latitude)s, %(longitude)s"``.

        :param bool exactly_one: Return one result or a list of results, if
            available.

        :param int maxresults: Defines the maximum number of items in the
            response structure. If not provided and there are multiple results
            the HERE API will return 10 results by default. This will be reset
            to one if ``exactly_one`` is True.

        :param int pageinformation: A key which identifies the page to be returned
            when the response is separated into multiple pages. Only useful when
            ``maxresults`` is also provided.

        :param str language: Affects the language of the response,
            must be a RFC 4647 language code, e.g. 'en-US'.

        :param str additional_data: A string with key-value pairs as described on
            https://developer.here.com/documentation/geocoder/topics/resource-params-additional.html.
            These will be added as one query parameter to the URL.

        :param int timeout: Time, in seconds, to wait for the geocoding service
            to respond before raising a :class:`geopy.exc.GeocoderTimedOut`
            exception. Set this only if you wish to override, on this call
            only, the value set during the geocoder's initialization.

        :rtype: ``None``, :class:`geopy.location.Location` or a list of them, if
            ``exactly_one=False``.
        """
        if isinstance(query, dict):
            params = {
                key: val
                for key, val
                in query.items()
                if key in self.structured_query_params
            }
            params['app_id'] = self.app_id
            params['app_code'] = self.app_code
        else:
            params = {
                'searchtext': self.format_string % query,
                'app_id': self.app_id,
                'app_code': self.app_code
            }
        if bbox:
            params['bbox'] = self._format_bounding_box(
                bbox, "%(lat2)s,%(lon1)s;%(lat1)s,%(lon2)s")
        if mapview:
            params['mapview'] = self._format_bounding_box(
                mapview, "%(lat2)s,%(lon1)s;%(lat1)s,%(lon2)s")
        if pageinformation:
            params['pageinformation'] = pageinformation
        if maxresults:
            params['maxresults'] = maxresults
        if exactly_one:
            params['maxresults'] = 1
        if language:
            params['language'] = language
        if additional_data:
            params['additionaldata'] = additional_data

        url = "?".join((self.api, urlencode(params)))
        logger.debug("%s.geocode: %s", self.__class__.__name__, url)
        return self._parse_json(
            self._call_geocoder(url, timeout=timeout),
            exactly_one
        )