\subsection{Privacy Element}
\label{sec:privacy}

The \xmlelement{privacy} element indicates whether third parties may be
able to hear or view parts of the communication.

\begin{description}
\item[public:] Others may be able to see or hear the
communications.

\item[private:] Inappropriate individuals are not likely
to see or hear the communications.

\item[quiet:] The presentity is in a place such as a library,
restaurant, place-of-worship, or theater that discourages noise,
conversation and other distractions.

\end{description}

This indication is not limited to voice communications.  For example, a
presentity might label her privacy as ``quiet'' when giving a talk,
since it would be inappropriate if an instant message popped up on the
laptop screen that is being projected for the audience. 

\motivation{The \element{placetype} element can be used by logic
executing on the watcher or by a composer to filter, sort and label
tuples.  For example, a composer may have rules that limit the
publication of tuples labeled as ``quiet'' to a select subset of the
watchers.}

The \element{activity} element {\MAY} be qualified with the 'from' and
'until' attributes to describe the time when the element assumed this
value and the time until which is element is expected to be valid. The
'from' time {\MUST} be in the past, the 'until' time in the future
relative to the publication of the presence information.
