Errors in spec

Table 1:  next to last entry (i.e., row with (0,2) -, 37) says that
minOccurs is positive integer.  It may also be zero.

Section 2.3.2 Union Types:  Not clear what is meant by "singleton" in
American states being singleton letter abbreviations.  The abbreviations
are 2 letters longs.  To me, at least, singleton letter implies the
abbreviations are only 1 letter long.

Art Salwin
salwin@mitretek.org
(202) 863-2985