OCLCThe Virtual International Authority File is a multinational authority service that links name authority records from over 50 national libraries and other cultural heritage organizations into unified clusters, each identified by a persistent URI. Hosted and maintained by OCLC, VIAF is a foundational component of the global library linked data infrastructure, enabling cross-border discovery and interoperability of bibliographic data.
Background
VIAF originated in 1998 as a joint project between the Library of Congress and the Deutsche Nationalbibliothek (German National Library), with the goal of linking their respective name authority files. The Bibliotheque nationale de France joined shortly after. The project was formalized as a service in 2003, and in 2012 OCLC assumed operational responsibility. The service was assigned the OCLC trademark and has since grown to include contributions from more than 50 institutions spanning every inhabited continent.
The fundamental insight behind VIAF is that national libraries independently maintain authority records for the same people, organizations, and works, often under different name forms and in different scripts. By algorithmically matching these records and presenting them as clusters, VIAF eliminates redundant effort and provides a single point of reference.
Purpose & Scope
VIAF covers personal names, corporate names, geographic names, works, and expressions. For each entity, the VIAF cluster contains:
- A VIAF identifier (persistent numeric ID)
- Links to authority records in each contributing institution
- Preferred and variant name forms from all contributors
- Basic biographical or descriptive data where available
The service supports both human browsing through a web search interface and machine access through APIs and data downloads.
VIAF Contributors
As of the last dataset update in September 2024, over 50 organizations contribute authority data to VIAF, including:
| Contributor | Code |
|---|---|
| Library of Congress/NACO | LC |
| German National Library | DNB |
| National Library of France | BNF |
| National Library of Israel | NLI |
| National Library of Australia | NLA |
| ISNI | ISNI |
| Wikidata | WKP |
| Union List of Artist Names (Getty) | JPG |
Many other national libraries from Europe, Asia, the Americas, and the Middle East also participate.
Serializations & Technical Formats
VIAF data is available for bulk download and through APIs. Individual VIAF records can be retrieved in multiple formats by content negotiation on the VIAF URI. The VIAF namespace uses the base URI http://viaf.org/viaf/ followed by the numeric cluster identifier.
Governance & Maintenance
VIAF is operated by OCLC as part of its global library services portfolio. The VIAF Council, comprising representatives of contributing institutions, provides governance oversight. Data matching and cluster creation are performed algorithmically, with manual review processes for disputed matches. The dataset is periodically refreshed as contributing institutions update their authority files.
Notable Implementations
VIAF identifiers are widely used as linking mechanisms in library catalogs, digital repositories, and knowledge bases. Wikipedia and Wikidata reference VIAF identifiers for authority control. The International Standard Name Identifier (ISNI) service uses VIAF as one of its source files. Many library discovery systems resolve VIAF URIs to display consolidated authority information.
Related Standards
VIAF is closely related to other authority control systems and services including ISNI, the Library of Congress Name Authority File (LCNAF), and Wikidata. It also intersects with the Getty vocabularies (ULAN is a VIAF contributor) and various national authority file systems.