[Petra Broeksma]

I just solved the problem myself! 😀
To tag items on a masterpage, and have them appear in the same order in the structure pane when new pages are added:
Use anchored frames. Make a frame for the ROW element (the root element). Inside that frame, paste the frames for NAME and CITY. (By cutting a frame, and pasting it inline within another frame, the pasted frame will become an anchored object). The settings for the anchored objects should be custom (in stead of ‘inline’ or ‘above line’). This way the anchored frames can be moved around on the page freely, independent of the main text frame (in this case the ROW frame).
Tag all frames.
Insert new pages based on this masterpage. The elements will be in exactly the same order as on the master page.

[Petra Broeksma]

Sorry, what I wrote wasn’t completely correct. This what I should have written:

In stead of (what I want):
ROW
NAME
..DATA
CITY
..DATA
ROW
NAME
..DATA
CITY
..DATA

It becomes:
ROW
NAME
..DATA
CITY
..DATA
NAME
..DATA
CITY
..DATA
ROW

If I add a new page (a new row/record), the elements should be added at the bottom of elements in the structure pane. But instead, the new elements are mixed with the existing ones.

I would really aprreciate any tips!