XML Schema which can be used to validate replies to all OAI-PMH v.2.0 requests. Herbert Van de Sompel. April 8th 2002. Validated with XML Spy v.4.3 on April 8th 2002. Validated with XSV 1.203.2.45/1.106.2.22 of 2002/01/11 16:40:28 on April 8th 2002.