I haven't read the ICAO document above, but I'm pretty sure its mentioned in the UK Aerodrome Licensing Manual.
From memory, I seem to recall taxiways are labelled from A to Z from one end of the runway to the other, a parallel taxiway taking on the letter of the first intersection, with the numbers starting at 1 for closest to the runway, working backwards.
I also seem to recall that working backwards toward the runway (ie, apron taxilanes, etc) they start Z - A.
Could be all different nowadays though - and that said; from the airfields I know a bit about - the guidance isn't followed.
Something along the lines of "if it's not broke, don't fix it" I reckon.
