In order to see their chat status (which can be one of ``online'', ``offline'',
and several ``away'' or ``do not disturb'' states), a user needs to subscribe to
the other user's status. The mechanism behind this is called
-\term{Publish-Subscribe} and is specified in XEP-0060~\cite{xep-0060}. It can
+\term{Publish-Subscribe} and is specified in XEP-0060~\cite{xep0060}. It can
be used to notify interested users about changes in personal information, and
implements the classic Observer pattern.
\subsubsection{Multi-User Chats}
Besides one-to-one messaging, XMPP also allows users to create multi-user
-chat rooms, which is specified in \cite{xep-0045}. Each chat room is given a
+chat rooms, which is specified in \cite{xep0045}. Each chat room is given a
unique JID to which the users send their messages to. Each incoming message is
then dispatched to all users which have joined the room.
\pages{1}
To overcome the need for a central server and authentication, XMPP Serverless
-Messaging~\cite{xep-0174} allows XMPP clients on a network to build a
+Messaging~\cite{xep0174} allows XMPP clients on a network to build a
peer-to-peer mesh network and chat directly with each other. This feature was
first introduced by Apple as part of their \term{Bonjour} project, and nowadays
it is also available in many other XMPP clients.