InDesign code/script?

I have these text files, which supposedly are readable by InDesign, that is, they were represented as tagged files. ID will open them, but the tagging does nothing.

It looks like this:

;gcUNITED STATES OF AMERICA
;psAlabama
;nsJournal of Incendiary Devices
;nsLake County Courier

These files seem to have been created on a Mac OSx.

I am assuming that the ;gc is paragraph formatting for a heading, ;ps is formatting for a subheading, and ;ns is formatting for the text but there are a lot more codes, including occasional codes for diacriticals and some that look like codes for line breaks.

Anybody know what these things are and how to make them look right in InDesign? I’m using CS3 but also tried it with similar results on a computer running CS5.