In practice, I've also used it for things such as the Australian city name extension provided above. Both files have identical formats. The 'level of importance' codes are relative values. In the above text, Portland and Fort Nelson are given LOI codes of 2, indicating they are 'more important' than Prince George and Medford, which in turn are more important than Olympia. If text gets crowded, therefore, Guide will show the 'more important' places and omit the 'less important' places.
Some places have an 'n', indicating a national capital.
No use is made of this yet, but eventually, Guide will probably show a special symbol for such places. Usually, only a few city names need to be translated in this manner. However, when you right-click on an Ax.0 star in Guide, you get an R, B, and a V magnitude. People have asked how this is derived. This is not exactly the best way imaginable to get a V magnitude, of course.