> * Added Markdown (BlueCloth 0.2.0b) and RDoc [Mauricio Ferndez] as
> command-line markup choices

Can a page started in Markdown be subsequently edited in RDoc? [This would
probably mean storing some normalized representation of both; I am guessing
XML would suffice, and that there are ways of doing this without loss of
information e.g. pass through things that won't translate as straight XML
strings].

It not already there, would this structure be a good idea?
    input_filter-->normalized-->output_filter