pbcoreRelationType describes the relationship between the asset being describe by the pbcore document and any other asset. Ideally it would contain text from a controlled vocabulary for describing relationships. There is some depth to what a relationship could be. The assets can be related as different episodes in a series, different tapes in a box set, or different versions of an original, among others.

Best practice: the assets may be related in that they are different discrete parts of a single intellectual unit, one may be a derivative of another, or they may be different versions that are distinct enough to be described as separate assets.

pbcoreRelationType can only be contained by pbcoreRelation.

Usage: required within relationType, not repeatable.


  • sourcerequired only for the elements pbcoreIdentifier and instantiationIdentifier; for all other elements, optional. Attribute source 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. Use attribute ref 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.
  • versionoptional. Attribute version identifies any version information about the authority or convention used to express data of this element.
  • annotationoptional. Attribute annotation includes narrative information intended to clarify the nature of data used in the element. Can be used as a notes field to include any additional information about the element or associated attributes.


pbcoreRelationType contains no subelements.

Controlled Vocabularies

PBCore relationType (recommended)
Dublin Core RDF Schema Declaration of Relation Types


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