Google Calendar API, incremental sync: does each calendar require its own sync token?

Question

If I have several Google Calendars under my Google account and want to incrementally sync all of the calendars, should I keep one common sync token for all calendars or a separate sync token for each calendar? In other words, are Events.getNextSyncToken() and Events.List.setSyncToken() specific to a single calendar or to all events no matter what calendar they belong to?

Answer 1

Seeing the sample Code based on the Document you have provided:

// Construct the {@link Calendar.Events.List} request, but don't execute it yet.
Calendar.Events.List request = client.events().list("primary");

It looks like each calendar have their own sync token.