<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _read_config(config_location):
 """ Read configuration for logging from a json file. Merges the read dictionary to LOGGING_CONFIG. :param config_location: Location of file. :return: nothing. """

    global LOGGING_CONFIG
    with open(config_location, "r") as config_loc:
        cfg_file = json.load(config_loc)
        if "logging" in cfg_file:
            log_dict = cfg_file.get("logging")
            with open(os.path.abspath(os.path.join(__file__,
                                                   os.path.pardir,
                                                   'logging_schema.json'))) as schema_file:
                logging_schema = json.load(schema_file)
                jsonschema.validate(log_dict, logging_schema)
                merged = jsonmerge.merge(LOGGING_CONFIG, log_dict)
                LOGGING_CONFIG = merged