Tested with https://github.com/zimeon/oaipmh-validator ### Checking for version 2.0 specific exceptions REQUEST: baseURL?verb=ListRecords&metadataPrefix=oai_dc&until=-001 GET FAIL: Error code noRecordsMatch not found in response but should be given to the request: verb=ListRecords&metadataPrefix=oai_dc&until=-001 The request specified a date one year before the earliestDatestamp given in the Identify response. There should therefore not be any records with datestamps on or before this date and a noRecordsMatch error code should be returned. See https://www.openarchives.org/OAI/openarchivesprotocol.html#ErrorConditions and 4.3 ListIdentifiers