This type is crafted for applications wishing to present a "roster" as
seen in most Instant Messaging clients. It represents an entry in the
logical roster, containing data on the current presence of a given user.
In addition to the current presence state, the type also contains
information on the relative presence subscriptions.
Subscriptions represent a presence-watching relationship between two
users.
Below are examples in XML formats. All examples are shown with all inherited members. Quoting when required is part of the examples, but you must obviously populate with your own data.