This element encodes information about an external reference.

Data model

Definition of the ExternalReference element
Field Type Status Description
id string required An application specific identifier
description string optional An application specific description


  "id": "PMID:30962759",
  "description": "Recurrent Erythema Nodosum in a Child with a SHOC2 Gene Mutation"


The syntax of the identifier is application specific. It is RECOMMENDED that this is a CURIE that uniquely identifies the evidence source, e.g. ISBN:978-3-16-148410-0 or PMID:123456. However, it could be a URL/URI, or other relevant identifier.

It is RECOMMENDED to use a CURIE identifier and corresponding Resource.


An optional free text description of the evidence.