====== Authorities in Evergreen 2.0 ======

You can load authority records into your Evergreen instance and use those authority records to control the fields in bibliographic records.

===== Features in Evergreen 2.0 =====

Some of the authority-oriented features in Evergreen 2.0 include:
  * Following the [[http://www.loc.gov/marc/bibliographic/ecbdcntf.html|Library of Congress standard]], a field in a bibliographic record is controlled by an authority record when it contains a ‡0 subfield. In Evergreen, the system control number in the ‡0 subfield is always interpreted as the local ID for the authority record.
  * When an authority record is edited or merged with another authority record, changes in authority records are automatically propagated to linked bibliographic records.
  * A user interface for managing authorities, including searching, editing, merging, and deleting authorities.
  * A script for linking fields in a set of uncontrolled bibliographic records to a set of authority records.

===== Limitations of authorities in Evergreen 2.0 =====

Some of the limitations of authorities in Evergreen 2.0 include:
  * "Manage authorities" searches only match the 1XX fields of authority records. "MARC Editor" context menu searches search the 4XX and 5XX fields that correspond to the 1XX fields.
    * Field mappings for authority searches are currently hard-coded into the following categories:
      * **Author**: 100‡a, 110‡a, 111‡a
      * **Subject**: 148‡a, 150‡a, 151‡a, 155‡a
      * **Title**: 130‡a
      * **Topic**: 150‡a
  * Authority records can only control bibliographic records; no linkage from authority record to authority record is currently supported. So, for example, an authority record containing a 5XX //see also from// field cannot have that field controlled by the appropriate authority record that contains the value as its 1XX field.

===== Common authority tasks =====

Authority tasks include:
  * [[cataloging:authorities:2.0:importing_authority_records]]
  * [[cataloging:authorities:2.0:creating_authority_records]]
  * [[cataloging:authorities:2.0:searching_for_authority_records]]
  * [[cataloging:authorities:2.0:editing_authority_records]]
  * [[cataloging:authorities:2.0:merging_authority_records]]
  * [[cataloging:authorities:2.0:deleting_authority_records]]
  * [[cataloging:authorities:2.0:controlling_bibliographic_records_with_authority_records]]