Manages private data, which is a mechanism to allow users to store arbitrary XML data on an XMPP server. Each private data chunk is defined by a element name and XML namespace. Example private data:

<color xmlns="http://example.com/xmpp/color">
    <favorite>blue</blue>
    <leastFavorite>puce</leastFavorite>
</color>

JEP related: JEP-49