ExternalIdentifier

An identification of an entity that is owned by or originates in a software system different from the current system, for example a ProductOrder handed off from a commerce platform into an order handling system. The structure identifies the system itself, the nature of the entity within the system (e.g. class name) and the unique ID of the entity within the system. It is anticipated that multiple external IDs can be held for a single entity, e.g. if the entity passed through multiple systems on the way to the current system. In this case the consumer is expected to sequence the IDs in the array in reverse order of provenance, i.e. most recent system first in the list.

Name	Type	Description	Example
@type (1)	string	When sub-classing, this defines the sub-class Extensible name
@baseType	string	When sub-classing, this defines the super-class
@schemaLocation	string	A URI to a JSON-Schema file that defines additional attributes and relationships
id	string	Unique identifier	2d7ed5fd-9f62-4211-bc84-357f5f7b80f5
href	URI	Hyperlink reference	https://example.org/resource/id
externalIdentifierType	string	Type of the identification, typically would be the type of the entity within the external system	ProductOrder
owner	string	Name of the external system that owns the entity.	AcmeCommerce