I have prepared a book with several editions in
Wikidata so you can get the feeling of what the structure looks like
It is based on the set of properties described
at the Books Task Force page, which are supposed to be inter-operable
with the Wikipedia infobox (each language wikipedia will be able to
feature a different edition as soon as arbitrary item access is available), Wikisource and Commons.
http://www.wikidata.org/wiki/Wikidata:Books_task_forceThe "edition items" in Wikidata could in turn be connected to the new BookManagerv2 extension that Molly is preparing for her GsoC: