OLAC Best Practice for related expression of expression

Prefer narrower element. When recording expressions contained within an aggregate, use Manifestation: expression manifested.

A contents note is provided unless the contents are already given in another part of the description.

Record when readily available.

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Apply a term from LCNAF. For moving image materials, most related expressions will have to do with language expressions. Authorized access points for different language expressions of a film are applied only in the case of soundtracks, not subtitles.