It should probably be added to a spec at some point. Perhaps Web DOM Core could be expanded to cover Range & Tranversal?
There is:
http://bitbucket.org/ms2ger/dom-rangeI am not sure if it is a good idea to put Range into DOM Core. Range probably means doing Selection too and that is quite far away from what DOM Core is about.
-- Anne van Kesteren http://annevankesteren.nl/