Exception specification when overriding a virtual function?

Question

If a class inherits from another and overrides a virtual function, how must the exception-specification for the derived (overridden) function be related to the base function

Answer 1

Yes, it must be at least as restrictive (§15.4/3):

If a virtual function has an exception-specification, all declarations, including the definition, of any function that overrides that virtual function in any derived class shall only allow exceptions that are allowed by the exception-specification of the base class virtual function.

Answer 2

It is $15.4 p.5 in http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf: "If a virtual function has an exception-specification, all declarations, including the definition, of any function that overrides that virtual function in any derived class shall only allow exceptions that are allowed by the exception-specification of the base class virtual function"