First of all the new manual is beautifully clear, concise and even poetic in some ways.
You problem is that you are using the wrong version of xml. When you chose to export xml for FCP X do use the drop down to chose “Files of type” in the menu that appears after you right click on the graded timeline and chose export in the conform page. You have to chose xml type that matches your version of FCP X. If you kept up with the upgrades it is most likely to be 1.1