Authority control
Encyclopedia
Authority control is the practice of creating and maintaining index terms for bibliographic material in a catalog
in library and information science
. Authority control fulfills two important functions. First, it enables catalogers to disambiguate items with similar or identical headings. For example, two authors who happen to have published under the same name can be distinguished from each other by adding middle initials, birth and/or death (or flourished
, if these are unknown) dates, or a descriptive epithet to the heading of one (or both) authors. Second, authority control is used by catalogers to collocate
materials that logically belong together, although they present themselves differently. For example, authority records are used to establish uniform title
s, which can collocate all versions of a given work together even when they are issued under different titles.
Although theoretically, any piece of information on a given book is amenable to authority control, catalogers typically focus on authors and titles. Subject headings
fulfill a function similar to authority records, although they are usually considered separately.
It is to be remembered that the function of authority files is essentially organizational, rather than informational. That is to say, they (ideally) contain a sufficient amount of information to establish a given author or title as unique, while excluding information that, while perhaps interesting to a reader, does not contribute to this goal.
Although practices certainly vary internationally, in the English-speaking world, it is generally the case that a valid authority record must contain:
Heading refers to the form of name (or title) that the cataloguer has chosen as the authorized form.
Cross references are other forms of the name (or title) that might appear in the catalog. There are two types of cross-references: see references, which reference forms of the name (or title) that have been deprecated in favor of the authorized form; and see also references, which point to other forms of the name (or title) that are authorized. See also references are most commonly used to point to earlier or later forms of a name (or title).
Statement(s) of justification: In addition to providing a heading and applicable references, a valid authority record should also contain a reference to whatever sources of information the cataloguer used to determine both the authorized and any deprecated forms of the name. This is usually done by citing the title and publication date of the source, the location of the name (or title) on that source, and the form in which it appears on that source.
An example authority record, for author Flann O'Brien
, taken from the United States Library of Congress authorities files, is reproduced below. (The original record has been abbreviated somewhat for clarity):
O’Brien, Flann, 1911-1966
Na Gopaleen, Myles, 1911-1966
Knowall, George
Na gCopaleen, Myles, 1911-1966
His At Swim-Two-Birds ... 1939.
His The best of Myles, 1983: CIP t.p. (Myles na Gopaleen (Flann O’Brien))
His Myles away from Dublin, 1985: t.p. (Myles na Gopaleen (Flann O’Brien) selection from the
column written for ... under the name of George Knowall)
Rhapsody in Stephen’s green, 1994: t.p. (Flann O’Brien (Myles na gCopaleen))
This example contains all the elements of a valid authority record: the first heading is the form of the name that the Library of Congress
has chosen to be authoritative. In theory, every record in the catalog that represents a work by this author should have this form of the name as its author heading. What follows immediately below is a set of see references. These forms of the author's name will appear in the catalog, but only as transcriptions, not as headings. If a user queries the catalog under one of these variant forms of the author's name, she would receive the response: "See O’Brien, Flann, 1911-1966." (See also references, which point from one authorized heading to another authorized heading, are exceedingly rare for personal name authority records, although they often appear in name authority records for corporate bodies.) The final four entries in this record constitute the justification for this particular form of the name: it appeared in this form on the 1939 edition of the author's novel At Swim-Two-Birds, whereas the author's other noms de plume appeared on later publications.
s and the Internet, the work of creating and maintaining a library's authority files was generally carried out (if at all) by individual cataloguing departments. This meant that there could be a fair amount of disagreement among libraries over which form of a given name was considered authoritative; so long as a library's catalog was internally consistent, differences between catalogs didn't much matter.
However, even before the Internet revolutionized the way libraries go about cataloguing their materials, catalogers began moving toward the establishment of cooperative consortia, such as OCLC
and RLIN in the United States, in which cataloguing departments from libraries all over the world contributed their records to, and took their records from, a shared database. This development gave rise to the need for national standards for authority work.
In the United States, the primary organization for maintaining cataloguing standards with respect to authority work operates under the aegis of the Library of Congress
, and is known as the Name Authority Cooperative Program, or NACO
Authority.
Library catalog
A library catalog is a register of all bibliographic items found in a library or group of libraries, such as a network of libraries at several locations...
in library and information science
Library and information science
Library and information science is a merging of the two fields library science and information science...
. Authority control fulfills two important functions. First, it enables catalogers to disambiguate items with similar or identical headings. For example, two authors who happen to have published under the same name can be distinguished from each other by adding middle initials, birth and/or death (or flourished
Floruit
Floruit , abbreviated fl. , is a Latin verb meaning "flourished", denoting the period of time during which something was active...
, if these are unknown) dates, or a descriptive epithet to the heading of one (or both) authors. Second, authority control is used by catalogers to collocate
Collocation
In corpus linguistics, collocation defines a sequence of words or terms that co-occur more often than would be expected by chance. In phraseology, collocation is a sub-type of phraseme. An example of a phraseological collocation is the expression strong tea...
materials that logically belong together, although they present themselves differently. For example, authority records are used to establish uniform title
Uniform title
A uniform title in library cataloging is a title assigned to a work which either has no title or has appeared under more than one title. It is part of authority control...
s, which can collocate all versions of a given work together even when they are issued under different titles.
Although theoretically, any piece of information on a given book is amenable to authority control, catalogers typically focus on authors and titles. Subject headings
Library of Congress Subject Headings
The Library of Congress Subject Headings comprise a thesaurus of subject headings, maintained by the United States Library of Congress, for use in bibliographic records...
fulfill a function similar to authority records, although they are usually considered separately.
Authority records
The most common way of enforcing authority control in a bibliographic catalog is to set up a separate index of authority records, which relates to and governs the headings used in the main catalog. This separate index is often referred to as an "authority file." It contains an indexable record of all decisions made by catalogers in a given library (or -- as is increasingly the case -- cataloguing consortium), which catalogers consult when making, or revising, decisions about headings.It is to be remembered that the function of authority files is essentially organizational, rather than informational. That is to say, they (ideally) contain a sufficient amount of information to establish a given author or title as unique, while excluding information that, while perhaps interesting to a reader, does not contribute to this goal.
Although practices certainly vary internationally, in the English-speaking world, it is generally the case that a valid authority record must contain:
- A heading
- Any cross references
- Statement(s) of justification
Heading refers to the form of name (or title) that the cataloguer has chosen as the authorized form.
Cross references are other forms of the name (or title) that might appear in the catalog. There are two types of cross-references: see references, which reference forms of the name (or title) that have been deprecated in favor of the authorized form; and see also references, which point to other forms of the name (or title) that are authorized. See also references are most commonly used to point to earlier or later forms of a name (or title).
Statement(s) of justification: In addition to providing a heading and applicable references, a valid authority record should also contain a reference to whatever sources of information the cataloguer used to determine both the authorized and any deprecated forms of the name. This is usually done by citing the title and publication date of the source, the location of the name (or title) on that source, and the form in which it appears on that source.
An example authority record, for author Flann O'Brien
Flann O'Brien
Brian O'Nolan was an Irish novelist, playwright and satirist regarded as a key figure in postmodern literature. Best known for novels such as At Swim-Two-Birds, The Third Policeman and An Béal Bocht and many satirical columns in The Irish Times Brian O'Nolan (5 October 1911 – 1 April 1966) was...
, taken from the United States Library of Congress authorities files, is reproduced below. (The original record has been abbreviated somewhat for clarity):
O’Brien, Flann, 1911-1966
Na Gopaleen, Myles, 1911-1966
Knowall, George
Na gCopaleen, Myles, 1911-1966
His At Swim-Two-Birds ... 1939.
His The best of Myles, 1983: CIP t.p. (Myles na Gopaleen (Flann O’Brien))
His Myles away from Dublin, 1985: t.p. (Myles na Gopaleen (Flann O’Brien) selection from the
column written for ... under the name of George Knowall)
Rhapsody in Stephen’s green, 1994: t.p. (Flann O’Brien (Myles na gCopaleen))
This example contains all the elements of a valid authority record: the first heading is the form of the name that the Library of Congress
Library of Congress
The Library of Congress is the research library of the United States Congress, de facto national library of the United States, and the oldest federal cultural institution in the United States. Located in three buildings in Washington, D.C., it is the largest library in the world by shelf space and...
has chosen to be authoritative. In theory, every record in the catalog that represents a work by this author should have this form of the name as its author heading. What follows immediately below is a set of see references. These forms of the author's name will appear in the catalog, but only as transcriptions, not as headings. If a user queries the catalog under one of these variant forms of the author's name, she would receive the response: "See O’Brien, Flann, 1911-1966." (See also references, which point from one authorized heading to another authorized heading, are exceedingly rare for personal name authority records, although they often appear in name authority records for corporate bodies.) The final four entries in this record constitute the justification for this particular form of the name: it appeared in this form on the 1939 edition of the author's novel At Swim-Two-Birds, whereas the author's other noms de plume appeared on later publications.
Access control
The act of choosing a single authorized heading to represent all forms of a name is often difficult, sometimes arbitrary and on occasion politically sensitive. An alternative is the idea of access control, where variant forms of a name are related without the endorsement of one particular form. See Linda Barnhart's Access Control Records: Prospects and Challenges from the 1996 OCLC conference 'Authority Control in the 21st Century'.Authority control and cooperative cataloging
Before the advent of digital OPACOPAC
An Online Public Access Catalog is an online database of materials held by a library or group of libraries...
s and the Internet, the work of creating and maintaining a library's authority files was generally carried out (if at all) by individual cataloguing departments. This meant that there could be a fair amount of disagreement among libraries over which form of a given name was considered authoritative; so long as a library's catalog was internally consistent, differences between catalogs didn't much matter.
However, even before the Internet revolutionized the way libraries go about cataloguing their materials, catalogers began moving toward the establishment of cooperative consortia, such as OCLC
OCLC
OCLC Online Computer Library Center, Inc. is "a nonprofit, membership, computer library service and research organization dedicated to the public purposes of furthering access to the world’s information and reducing information costs"...
and RLIN in the United States, in which cataloguing departments from libraries all over the world contributed their records to, and took their records from, a shared database. This development gave rise to the need for national standards for authority work.
In the United States, the primary organization for maintaining cataloguing standards with respect to authority work operates under the aegis of the Library of Congress
Library of Congress
The Library of Congress is the research library of the United States Congress, de facto national library of the United States, and the oldest federal cultural institution in the United States. Located in three buildings in Washington, D.C., it is the largest library in the world by shelf space and...
, and is known as the Name Authority Cooperative Program, or NACO
Authority.
Standards
- ISAAR (CPF) - International Standard Archival Authority Record for Corporate Bodies, Persons, and Families. Published by the International Council on Archives
- MARC standards for authority records in machine-readable format.
- Metadata Authority Description SchemaMetadata Authority Description SchemaMetadata Authority Description Schema is an XML schema developed by the United States Library of Congress' Network Development and Standards Office that provides an authority element set to complement the Metadata Object Description Schema ....
(MADS), an XML schema for an authority element set that may be used to provide metadata about agents (people, organizations), events, and terms (topics, geographics, genres, etc.). - Encoded Archival ContextEncoded Archival ContextEncoded Archival Context is an XML standard for encoding information about the creators of archival materials and the circumstances of record creation and use...
, an XML schema for authority records conforming to ISAAR(CPF)
See also
- Gemeinsame KörperschaftsdateiGemeinsame KörperschaftsdateiThe Common Corporation File or GKD is a German authority control for the organisation of corporation names from catalogues. It is used mainly for documentation in libraries...
(Common Corporation File or GKD), corporation authority file by the German National Library. - Knowledge Organization SystemsKnowledge Organization SystemsKnowledge Organization Systems is a generic term used in Knowledge organization about authority lists, classification systems, thesauri, topic maps, ontologies etc.-See also:*Controlled vocabulary*Ontology...
- PersonennamendateiPersonennamendateiThe Personennamendatei is an authority file of people, which serves primarily to access literature in libraries. The PND has been built up between 1995 and 1998 and is published by the German National Library...
(Personal name file or PND), name authority file by the German National Library. - Simple Knowledge Organization System (SKOS) for representation of thesauri, classification schemes, taxonomies, subject-heading systems, or any other type of structured controlled vocabulary.
- Virtual International Authority FileVirtual International Authority FileThe Virtual International Authority File is an international authority file. It is a joint project of several national libraries and operated by the Online Computer Library Center...
(VIAF), an aggregation of authority files currently focused on personal and corporate names.