2010-07-31T01:40:56Z http://oai.esds.ac.uk/oai.asp oai_dc http://www.openarchives.org/OAI/2.0/oai_dc.xsd http://www.openarchives.org/OAI/2.0/oai_dc/ marc http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd http://www.loc.gov/MARC21/slim ddi http://www.icpsr.umich.edu/DDI/Version1-2-2.xsd http://www.icpsr.umich.edu/DDI