def get_content_comments(self, content_id, expand=None, parent_version=None, start=None, limit=None,
                             location=None, depth=None, callback=None):
        """
        Returns the comments associated with a piece of content.
        :param content_id (string): A string containing the id of the content to retrieve children for.
        :param expand (string): OPTIONAL: a comma separated list of properties to expand on the children.
                                We can also specify some extensions such as extensions.inlineProperties (for getting
                                inline comment-specific properties) or extensions.resolution for the resolution status
                                of each comment in the results. Default: Empty
        :param parent_version (int): OPTIONAL: An int representing the version of the content to retrieve children for.
                                     Default: 0
        :param start (int): OPTIONAL: The index of the first item within the result set that should be returned.
                            Default: 0.
        :param limit (int): OPTIONAL: How many items should be returned after the start index. Default: Site limit.
        :param location (string): OPTIONAL: The location of the comments. Possible values are: "inline", "footer",
                                  "resolved". You can define multiple location params. The results will be the comments
                                  matched by any location. Default: "" (all).
        :param depth: The depth of the comments. Possible values are: "" (ROOT only), "all". Default: "".
        :param callback: OPTIONAL: The callback to execute on the resulting data, before the method returns.
                         Default: None (no callback, raw data returned).
        :return: The JSON data returned from the content/{id}/child/comment endpoint, or the results of the
                 callback. Will raise requests.HTTPError on bad input, potentially.
        """
        params = {}
        if expand:
            params["expand"] = expand
        if parent_version:
            params["parentVersion"] = parent_version
        if start is not None:
            params["start"] = int(start)
        if limit is not None:
            params["limit"] = int(limit)
        if location:
            params["location"] = location
        if depth:
            assert depth in {"", "all"}
            params["depth"] = depth
        return self._service_get_request("rest/api/content/{id}/child/comment".format(id=content_id),
                                         params=params, callback=callback)