This is a registration of classes and properties from International Standard Bibliographic Description (ISBD), consolidated edition, published by De Gruyter Saur in July 2011 (ISBN 978-3-11-026379-4). @en
(2015-03-29) Bernard Vatant: ISBD is an IFLA standard. More details at http://www.ifla.org/publications/international-standard-bibliographic-description. Full version history available at http://metadataregistry.org/schemahistory/list/schema_id/25.html