In email to the comments list, Jeremy Carrol asks:

  The datatypes for recurring calendar events (specifically gMonthDay,
  gDay and gMonth) are all recorded in appendix A with:

    <hfp:hasProperty name="cardinality" value="countably infinite"/> 

  However it appears that there are at most 366 days in a year, and at
  most 59?  timezones or maybe 290000 if we take an extremist view of
  the possible timezones. (Alternatively, the lexical form is of
  finite length and comes from a finite vocabulary, hence there are
  finitely many different lexical forms).

  Is this an oversight? 

See:
http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002OctDec/0068.html

Discussed at the 2003-11-20 telecon. Agreed to classify as error w/erratum. 
Agreed to change countably infinite to finite. Ashok to draft text.

Sandy Gao adds:

  And whenever we change cardinality to finite, we also need to change
  bounded to "true".

This bug report is for version 1.0 only; bug 2179 is the 1.1 twin.