Schema for description section of Identify reply of OAI-PMH v2.0. For repositories that comply with the oai format for unique identifiers for items records. See: http://www.openarchives.org/OAI/2.0/guidelines-oai-identifier.htm Validated with http://www.w3.org/2001/03/webdata/xsv on 16May2002 Simeon Warner $Date:$