CalendarContract.EventsColumns.SYNC_DATA1 - SYNCDATA10 are said to be 
columns of the content provider for use with sync adapters. Does anybody 
know if there is some convention for what is the use of these columns? I've 
realized that on my device SYNC_DATA5 stores the date last modified and 
SYNC_DATA1 seems to store the Google event ID. So it seems whenever the 
Calendar app syncs with Google Calendar, these columns are modified.

However, if I choose to use one of these columns for my sync adapter, how 
can I make sure another application doesn't use the very same columns and 
they override each other?

If SYNC_DATA5 is ALWAYS used by Google Calendar to store the date last 
modified I would be fine with just using that for my sync logic, I just 
need to be certain that this is a convention.

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