1. 2001-09-27 Re: Derived types, SubstitutionGroup, Keys and Keyref xerces-j- neilg 2. 2001-09-27 Re: Derived types, SubstitutionGroup, Keys and Keyref xerces-j- neilg 3. 2001-09-27 Derived types, SubstitutionGroup, Keys and Keyrefs xerces-j- John Powell 4. 2001-09-27 Derived types, SubstitutionGroup, Keys and Keyrefs xerces-j- John Powell