Does `SubscriptionMode` only apply to `STREAM` subscriptions?

[wenovus]

enum SubscriptionMode {
  TARGET_DEFINED = 0;  // The target selects the relevant mode for each element.
  ON_CHANGE      = 1;  // The target sends an update on element value change.
  SAMPLE         = 2;  // The target samples values according to the interval.
}

Since the spec only talks about this for STREAM, it appears to me that this is only relevant to STREAM subscriptions, and not ONCE or POLL. Is my understanding correct?

[robshakir]

Yes, I think that is correct, since ONCE will mean all values should be sent now (regardless of how they are updated), and POLL says the same thing, just on a repeated basis, then these appear only relevant to STREAM.

r.