We're changing the TCP/IP domain name we use internally. I've created the
new zone and added a few entries to it manually. I would like to export the
old zone, clean it up and then import it into the new zone. I've done some
testing with this and it looks like I can import the whole zone, but it
overwrites anything that's already there. Is there a way to only import
"new" stuff without blowing away the existing entries?