Posted when a process other than the current one has changed the Address Book database.
- macOS 10.2+
Depending on the operation performed on the address book, one or more of the following keys may be included in the user-info dictionary:
k. The values for each of the keys are the unique IDs of the records that were inserted, updated, or deleted, respectively. If the values for all the keys are
nil, every record has changes. For example, this happens when the Address Book database is restored from a backup copy.