Schematron using XPath 2.0
msn:Mission_Information/msn:ephemeris_start_time/msn:ephemeris_start_time
The attribute @unit must be equal to one of the following values 'day', 'hr', 'julian day', 'microseconds', 'min', 'ms', 'ns', 's', 'yr'.
msn:Mission_Information/msn:ephemeris_stop_time/msn:ephemeris_stop_time
The attribute @unit must be equal to one of the following values 'day', 'hr', 'julian day', 'microseconds', 'min', 'ms', 'ns', 's', 'yr'.
msn:Surface_Mission/msn:solar_longitude/msn:solar_longitude
The attribute @unit must be equal to one of the following values 'arcmin', 'arcsec', 'deg', 'hr', 'microrad', 'mrad', 'rad'.