instantiationFileSize indicates the file size of a digital instantiation. It should contain only numerical values. As a standard, express the file size in bytes. Units of Measure should be declared in the unitsOfMeasure attribute.

instantiationFileSize can be contained by pbcoreInstantiation, pbcoreInstantiationDocument, or instantiationPart.

Usage: optional, not repeatable.


  • unitsOfMeasureoptionalThe unitsOfMeasure attribute defines the unit used in the containing element, e.g. pixels, GB, Mb/s, ips, fps, kHz, inches, lines, dpi. We recommend standardizing the notation that is most widely recognized in your institution and using with consistency.
  • source –optionalThe 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.
  • ref – optionalThe 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 – optionalThe version attribute identifies any version information about the authority or convention used to express data of this element. 
  • annotation – optionalThe annotation attribute includes narrative information intended to clarify the nature of data used in the element. This element can be used as a notes field to include any additional information about the element or associated attributes.


instantiationFileSize contains no subelements.


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