9. Subject Identifiers

[type of data: normalized heading—other entity identifiers]

If an identifier has already been created in the catalog for a particular subject, use that identifier for all subsequently acquired works that are about that subject. If the identifier for a subject changes over time, change each normalized ocurrence of the identifier throughout the catalog.

Use literary warrant to determine the subject identifier to be used for a particular concept, object, place, event, etc. In other words, choose as the subject identifier the name by which the concept, object, place, event, etc. is commonly referred to in the literature.

Variant subject heading access

Ensure that catalog users doing any type of catalog search can search under any form of name that has been used to denote a particular concept, object, place, event, etc., and be led to the form of name being used in the catalog to identify that concept, object, place, event, etc. [type of data: normalized heading—variant identifiers]

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