This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
Productions [22] and [37] may cause the grammar to be ambiguous. See http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001AprJun/0245.html
There is an ambiguity. An erratum E2-10 was created to fix the problem.