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can be used for multi-part instantiations in which two or more discrete items may need to be described with individual technical metadata, such as a film that stretches over multiple reels, a CD set that contains several individual discs, or two video files that combine to form a multichannel installation.

As with pbcorePart, the record must still include required subelements (identifier with source and location) for the instantiation as a whole in order be valid. Each instantiationPart must also include these required elements, and all sub-elements must appear in the same order within an instantiationPart as within an instantiation.

Here is an example of a pbcoreDescriptionDocument that uses instantiationPart to describe different DVDs within a single box set.

DESCRIPTION DOCUMENT
ASSET TYPE: Compilation
Source: PBCore
IDENTIFIER: 978-1-62789-267-4
Source: ISBN
IDENTIFIER: 123456
Source: WGBH Barcode
TITLE: Wild West
Title Type: Box Set
DESCRIPTION: They were "heroes" and rebels, but they were all epic personalities who took center stage in the creation of the mythic Wild West. This superb selection of documentaries and authentically reproduced memorabilia combine to present compelling portraits of the icons who risked everything in a dazzling new land of opportunity.
Source: Back of box
GENRE: Documentary
COVERAGE
COVERAGE: American West
COVERAGE TYPE: Spatial
COVERAGE
COVERAGE: 19th Century
COVERAGE TYPE: Temporal
CREATOR
CREATOR: WGBH
CREATOR ROLE: Producer
CREATOR
CREATOR: Sharon Grimberg
CREATOR ROLE: Senior Producer
CREATOR
CREATOR: Mark Samuels
CREATOR ROLE: Executive Producer
Source: PBCore
PUBLISHER