I know that in SEED, and hence the DMC database, end times for stations or
channels that have not yet ended are generally given as something like the
year 2500, meaning "we don't know, but probably still operating". Given
that a missing endDate (which is optional) presumably means the same thing,
I wonder if it might not be better for the web service to not put an
enddate attribute if the date in question is in the future?
I guess this might have some negative performance consequences on the
server side. Might also be a "we only give out what the network operators
give us" issue.