You should try to reinstall the feature that deploys your list

Go to sharepoint 2010 management console and write

install-spfeature -path "feature folder name in 14'hive" -force

after this make an IISRESET and reload the page. This should be enough for the field to be visible.

By the way you should never include colname and rowordinal values in your xml. These will be provided automatically by sharepoint when field is deployed. One problem that you might face with current deployment is that there is already a list field mapped to colname="ntext3".

Sharepoint 2010 list schema deployment
I seem to remember reading that there were going to be three trilogies originally in Star Wars, i.e. they would add episodes 7 - 9.

Was that ever the case? What happened to that plan?

Update: looks like that original plan might be back after all!
