Jabber is often thought of simply as a system for instant messaging, albeit an open one. However, Jabber technology can be used, and is being used, in applications quite different from simple IM. One of these applications is whiteboarding. In collaborative work, the ability to draw (for example, to design sketches, UML schemas, house architectures, and organizational plans) is essential, as exemplified by the success of real-world whiteboarding applications such as Microsoft NetMeeting. Whiteboarding can also be used for entertainment purposes such as games and quizzes. Because of the value of whiteboarding as an important real-time collaboration tool, other IM services are beginning to offer these capabilities. For these and other reasons, I believe that a good protocol for whiteboarding in Jabber would be of great value.
There exists today a protocol draft for sending streaming XPM over Jabber. XPM is a bitmap format, which makes it well-suited for certain applications (e.g., smaller drawings and sketches). However, significant changes in an XPM image will require sending large amounts of XML data (even with the compression described in the protocol draft). Also, for example, XPM does not scale without loss of resolution, nor does it support metadata. In addition, the current draft specifies the data format only, not the way the data will be sent or handled by Jabber servers and clients.
Therefore, the Whiteboard SIG should develop a standard way of handling whiteboards in Jabber and a format for data transfer. This might be based on vector graphics, bitmap data, or a combination of these two. In addition, the protocol should work in the context of both regular messaging and conferencing. The protocol for whiteboarding during conferencing might depend on the new protocol proposal to come from the Conferencing SIG.
The Whiteboarding SIG should produce the following deliverables (these deliverables will be presented to the Jabber Council):
A set of requirements that the proposed protocol should fulfill.
There are today at least four different attempts    to create a whiteboarding protocol in Jabber. The Whiteboarding SIG should evaluate them all and see which features of each are worth keeping.
One or more data formats for the graphics data, presented both as a description and as a DTD or XML schema.
The actual protocol for how the graphics data is sent over Jabber. This will also include an analysis of any associated functionality that must be performed by Jabber servers and clients.
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The Extensible Messaging and Presence Protocol (XMPP) is defined in the XMPP Core (RFC 6120) and XMPP IM (RFC 6121) specifications contributed by the XMPP Standards Foundation to the Internet Standards Process, which is managed by the Internet Engineering Task Force in accordance with RFC 2026. Any protocol defined in this document has been developed outside the Internet Standards Process and is to be understood as an extension to XMPP rather than as an evolution, development, or modification of XMPP itself.
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The following requirements keywords as used in this document are to be interpreted as described in RFC 2119: "MUST", "SHALL", "REQUIRED"; "MUST NOT", "SHALL NOT"; "SHOULD", "RECOMMENDED"; "SHOULD NOT", "NOT RECOMMENDED"; "MAY", "OPTIONAL".
1. "Distributed SVG documents" (formerly at http://www.jabber.org/?oid=1025)
2. SVG over Jabber (http://www.protocol7.com/jabber/whiteboard_proposal.txt)
Note: Older versions of this specification might be available at http://xmpp.org/extensions/attic/