ISIL is the International Standard Identifier for Libraries and Related Organisations (ISO 15511). The ISIL-System is designed for international use and integrates already existing identifiers on national or international level.
ISIL is being supervised by the ISIL Registration Authority in Kopenhagen.
W3IDs are currently supported for US-*, IT-*, JP-*, DE-* and ZDB-* ISILs.
https://w3id.org/isil/US-NNM -> http://id.loc.gov/vocabulary/organizations/nnm.html
https://w3id.org/isil/IT-BO0001 -> http://anagrafe.iccu.sbn.it/opencms/opencms/ricerche/dettaglio.html?monocampo=IT-BO0001
https://w3id.org/isil/DE-1a -> http://ld.zdb-services.de/resource/organisations/DE-1a
https://w3id.org/isil/ZDB-1-TDA -> http://ld.zdb-services.de/resource/organisations/ZDB-1-TDA
https://w3id.org/isil/JP-1000046 -> http://id.ndl.go.jp/vocab/isil/JP-1000046