International Standard Identifier for Libraries and Related Organizations

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The International Standard Identifier for Libraries and Related Organisations (ISIL), ISO 15511, assigns unique identifiers to libraries and related organisations, such as archives and museums.[1]

The Danish National Library Authority is the international authority for maintaining the standard and its registry.[2]

An ISIL is alphanumeric, with a maximum of 16 characters.[2] Valid symbols are A-Z, 0-9, solidus, hyphen-minus and colon.

An ISIL consists of a prefix identifying the authority which issued the ISIL, a dash, and then an identifier issued by that authority. All two letter prefixes are reserved for the ISO 3166-1 alpha-2 country code, followed by an identifier assigned by that country's national library authority. Global-level identifiers can also be assigned, which are not associated with a particular country, e.g. 'oclc-' for the OCLC. The suffix is generally a pre-existing system of identifying libraries; thus, ISIL unifies existing systems around the world rather than instituting an entire system from scratch.

The code for the library of the Institution of Civil Engineers, for example, is UkLoICE,[3] the first two characters being the county code for the United Kingdom.


  1. ^ "ISO 15511:2011 - Information and documentation -- International standard identifier for libraries and related organizations (ISIL)". ISO. 2011-08-22. Retrieved 14 June 2014. 
  2. ^ a b "UK National Agency for ISIL". British Library. Retrieved 14 June 2014. 
  3. ^ "MARC organisation codes for the UK and its dependencies" (PDF). 2014-06-10. 10 June 20. Retrieved 14 June 2014.  Check date values in: |date= (help)

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