An optional URI parameter for insert, update, or delete queries that allows the caller to specify that it is a sync adapter. The default value is false. If true NoType:android/provider/ContactsContract$SyncColumns;Href=../../../reference/android/provider/ContactsContract.SyncColumns.html#DIRTY is not automatically set and the "syncToNetwork" parameter is set to false when calling Android.Content.ContentResolver.NotifyChange(Android.Net.Uri, Android.Database.ContentObserver, Android.Database.ContentObserver). This prevents an unnecessary extra synchronization, see the discussion of the delete operation in NoType:android/provider/ContactsContract$RawContacts;Href=../../../reference/android/provider/ContactsContract.RawContacts.html.