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831 Duplicate control field (O;R)
Field Definition and Scope
This field is used for database updating purposes only. It shall not be displayed in the WWW interface, nor shall its content be edited by a cataloguer.
Application of Content Designators
Indicators
Indicator 1: none
Indicator 2: Specifies the type of duplicate reference:
- 0 The record indicated in $a was reviewed by a cataloger and merger of the current and the indicated record into one is deprecated.
- 1 The record indicated in $a is probably a duplicate to the present record and should therefore be revised by a cataloguer.
- 2 The record indicated in $a will be merged to the present record in an updating process, since a cataloguer has considered it referring to the same entity.
Subfields
$a Record Identifier (M;NR)
Record ID of the record considered duplicate
Input Conventions
Examples
- 831 #1$acnp00081480
Internal Representation
{"meta": { "distinctFrom": ["Record ID ($a)"], "sameAs": ["Record ID ($a)"], "possibleMatch": [{ "id": "Record ID ($a)", "similarity": "Similarity ($b)" }] }}
Change History
- 17.07.2017: Subfields $8, $n and $z are no longer supported, once the CT has been migrated into its new environment