1.1 Work identification

[type of data: normalized heading—work identifier (literal); not repeatable]

Identify the work contained in the item being cataloged. If the work is already contained in the catalog, use the language-based work identifier already established. If the identifier changes over time, it should be changed in all places in which it appears in the catalog. Ideally, change would be carried out by using a key identifier that is associated with a language-based work identifier such that the language-based work identifier could be changed only once and immediately display whenever the key identifier is invoked.

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