XML Schema which can be used to validate replies to all OAI-PMH v2.0 requests. Herbert Van de Sompel, 2002-05-13. Validated with XML Spy v.4.3 on 2002-05-13. Validated with XSV 1.203.2.45/1.106.2.22 on 2002-05-13. Added definition of protocolVersionType instead of using anonymous type. No change of function. Simeon Warner, 2004-03-29.