Undo feature

[qjouda]

Hi All,

I am doing a Master thesis about Operational Transformation. I know the Undo is already supported by COT algorithm, but I couldn't find any APIs for Undoing an operation in this framework or the coweb-jsoe lib. Can someone tell if the feature is already there and not documented. If not, is it hard to implement? or could you some tips to start looking at implementing it?!

Thank you