I agree, there's been too much a wait already for a good XML document editor, not a mere markup tool. It does not look like bigger players like Google and Faceb

I agree, there's been too much a wait already for a good XML document editor, not a mere markup tool. It does not look like bigger players like Google and Facebook have interest in building components for this. Hopefully with LT, Brackets, Mondrian and now WebODF the necessary pieces are finally coming together. Good to know you have already started the more generic XML work. I'll take a look and see if I can find something to dig in.