Readonly mode

An answer that is perhaps a bit too obvious would be to say that you can transform the XML outside the editor, but if you still want to keep things within Xopus, you could perhaps cancel every event that adds elements or changes things. This would mean loading a different configuration. You could also use that configuration to hide elements and options in the interface.

A simple Example of preventing changes is the following:

Editor.addEventListener("load",load);

function load(evt)
{
var doc = Editor.getActiveDocument();
doc.addEventListener("XopusBeforeSubtreeModified", doNothing);
}

function doNothing(evt)
{
evt.cancelEvent = true;
}