* The description for Building is under a second section entitled 'LMK'
- the second section with this title.

* The description for a post office box is hidden under the 'PCN'
description.  It deserves its own description:
  The "post office box" element (POBOX) describes a container, such
  as a pigeon hole, at a central mailing location, where mail is held.

* The table on page 12 indicates that there is a "SEAT" type in
PIDF(-LO) - this is not true.

A6 -> RD