I've noticed inconsistencies in the way certain stations in my local market ID the digital service at the top of the hour. For example the NPR station here will ID as 'WLRN and HD-1 Miami, Fort Lauderdale' while a station owned by Cox Media will ID as 'WHQT Coral Gables' with no mention of the digital service even though they broadcast in HD. Is there a hard and fast rule for identifying the HD broadcast like there is with the analog signal? If so, wouldn't the Cox station be in violation of the rule for not mentioning the digital service?