instantiationGenerations identifies the use type and provenance of the instantiation. For example, the generation of a video tape may be an “Original Master” or “Dub,” the generation of a film reel may be an “Original Negative” or “Composite Positive,” an audiotape may be a “Master” or “Mix Element,” and an image may be a “Photograph” or a “Photocopy.”

instantiationGenerations can be contained by the elements pbcoreInstantiation, pbcoreInstantiationDocument, and instantiationPart.

Usage: optional, repeatable.


  • source – optional. The source attribute provides the name of the authority used to declare the value of the element. Different elements will use the source attribute slightly differently. For example, identifier source (required) should be the name of the organization, institution, system or namespace that the identifier came from, such as “PBS NOLA Code” or an institutional database identifier. For other elements, this might be the name of a controlled vocabulary, namespace or authority list, such as Library of Congress Subject Headings. We recommend a consistent and human readable use.
  • refoptional. The ref attribute is used to supply a source’s URI for the value of the element. Attribute ref can be used to point to a term in a controlled vocabulary, or a URI associated with a source.
  • version – optionalAttribute version identifies any version information about the authority or convention used to express data of this element.
  • annotation – optional. The annotation attribute includes narrative information intended to clarify the nature of data used in the element. This attribute can be used as a notes field to include any additional information about the element or associated attributes


instantiationGenerations contains no subelements.

Controlled vocabularies

PBCore instantiationGenerations (recommended)
Library of Congress Thesaurus for Graphic Materials


Submit any issues or suggested changes for future schema iterations by creating a ticket in our Github repository.