[pdurrant]

You can have separate entries for the different editions (I think - you might need to use titles with modifiers

This clearly is the right approach for different translations, and might be worth-while for substantially changed editions.

You might also want to add a custom column for 'first published' date, and leave the standard column for the edition date.

It all depends on how much effort you want to put in, and what you really want to record.

I tend to just use the standard column for the first published date, even if my text is from a revised edition. For instance, I have The Hobbit as 1937, even though the text is of the revised second edition of 1951.