The category "<longitude_setting>" can be expressed as follows:
<degree_setting-digit_sequence-180>
<degree_setting-digit_sequence-180> <minute_setting>
<degree_setting-digit_sequence-180> <minute_setting> <second_setting>
<degree_setting-not_digit_sequence-180>
<degree_setting-not_digit_sequence-180> <minute_setting>
<degree_setting-not_digit_sequence-180> <minute_setting> <second_setting>