// Type of the subscription. The string shall be set according to the \"subscriptionType\" attribute of the associated subscription data type defined in clauses 6.3.4, 6.3.5, 6.3.6, 6.3.7 6.3.8 and 6.3.9: \"UserLocationEventSubscription\" \"UserLocationPeriodicSubscription\" \"ZoneLocationEventSubscription\" \"ZoneStatusSubscription\" \"UserAreaSubscription\" \"UserDistanceSubscription\"