On May 16-17, 2011, the Berkman Center together with Open Knowledge Commons and the Institute for Information Law at the University of Amsterdam convened a group of technical and legal experts from public and research libraries and government agencies in the United States and Europe for a workshop focused on key questions regarding global interoperability in digital libraries. The goal of this meeting was to learn from the experiences of existing projects such as Europeana in order to apply these lessons to the Digital Public Library of America (DPLA) from the outset; much of the discussion focused on linked data in general and on linked library data in particular. Presentations examined interoperability of discovery, use, and deep research in existing global digital library infrastructure with a view toward ensuring that the DPLA adopts best practices in these areas.