This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
Section 18.5 states "To construct an instance of a user-defined type that is not in a namespace, it is necessary to use a cast expression or undeclare the default function namespace." (a) it should mention that this is not necessarily possible in all host languages, and that the examples given assume XQuery. (b) the statement is no longer true, since the required effect can be achieved using an EQName.
The WG accepted the change, which has been applied.