- Metadata Mapping between metadata formats Michael Day UKOLN: The UK Office for Library and Information Networking, University of Bath, Bath, BA2 7AY, United Kingdom http://www.ukoln.ac.uk/ m.day@ukoln.ac.uk MARC 21 to Dublin Core: MARC to Dublin Core Crosswalk - Library of Congress, Network Development and MARC Standards Office, February 2001. Available from: URL:http://www.loc.gov/marc/marc2dc.www.ukoln.ac.uk/metadata/interoperability