Concurrent XML editing by AJAX

Does there exist some framework for parallel editing XML-document on a web-page through AJAX?

I need a shared whiteboard, where I and other people can draw and see that draw others in real time ("live" mode).

Modern browsers support SVG, event-source and other useful things, and if such a framework exists, make such a board should simply.

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If not, what are the implementation on Operational Transformation and what engines for parallel connection of several clients over HTTP is best 开发者_JS百科to use?

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The keyword here is "collaborative editing" which is used extensively in Google Docs.

There's more info on the subject here: http://en.wikipedia.org/wiki/Collaborative_real-time_editor

Google Wave (which I believe was Google's first collaborative editing venture) is now open source: http://en.wikipedia.org/wiki/Google_Wave#Open_source

A bit of further reading should provide the answers you're looking for.