...the XML elements appear in the structure pane as if I had tagged the objects manually. When I right click on an element, the context menu shows "New Parent Element..." as an available option. However, it does not show the submenu for "New Parent Element..." that lists all the available tags in the doc. This submenu seems to only be available after I manually create a new tag and apply the tag to an object.
Is there a way to force the "New Parent Element..." context menu in the structure pane to display a submenu of available tags?