The S3 class which holds data of a single episode.
site_id
character string. Site ID, if presented, otherwise "NA".
episode_id
character string. Episode ID, if presented, otherwise "NA".
nhs_number
character string. NHS number, if presented, otherwise "NA".
pas_number
character string. PAS number, if presented, otherwise "NA".
parse_file
character string. The source XML file. If the source is not a file then "NA".
t_admission
POSIXct. Time of Admission to the ICU, if presented, otherwise NA.
t_discharge
POSIXct. Time of discharge of the ICU, if presented, otherwise NA.
parse_time
POSIXct. Parse time.
data
A list which holds all the data of this episode which is indexed by NIHIC code.