The priority that can be assigned to a contact element. The basic status type. The activity status type. The location status type. The type of a subscription. The presence information data type containing tuples of data and notes. A tuple containing the presentity's data. The status of a presentity. An URI defining a contact data set. An arbitrary note that can be attached to several elements. A subscription a watcher has made for watching a presentity. A watcher watching a presentity. An array of Subscriptions. An array of Watchers.