Remove Duplicate Line in Vim?

Question

I\'m trying to use VIM to remove a duplicate line in an XML file I created. (I can\'t recreate the file because the ID numbers will change.)

The file looks something

Answer 1

instead of using vim you do something like

sort filename | uniq -c | grep -v "^[ \t]*1[ \t]"

to figure out what is the duplicate line and then just use normal search to visit it and delete it