essenceTrackExtension is an extension element. Extensions are either a wrapper containing a specific element from another standard OR embedded xml containing the extension. The essenceTrackExtension element is a container to accomodate track-level metadata from external systems. Use it to supplement other metadata sub-elements of instantiationEssenceTrack in which it appears.

essenceTrackExtension can only be contained by instantiationEssenceTrack.

Usage: optional, repeatable.


essenceTrackExtension has no attributes.


essenceTrackExtension contains the following subelements:

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


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