Elements defined


pbcoreExtension is an extension element. Extensions are either a wrapper containing a specific element from another standard OR embedded xml containing the extension.

Best Practice: Use it to supplement other metadata sub-elements of the PBCore description document in which it appears.

Usage: optional, repeatable


This element cannot have any attributes.


  • extensionWrap: required ONLY if extensionEmbedded is not used | extensionWrap serves as a container for the elements extensionElement, extensionValue, and extensionAuthorityUsed.
  • extensionEmbedded: required ONLY if extensionWrap is not used | extensionEmbedded is an element allows the inclusion of xml from another schema, e.g. TEI, METS, etc.