{
  "resourceType" : "OperationOutcome",
  // from Resource: id, meta, implicitRules, and language
  // from DomainResource: text, contained, extension, and modifierExtension
  "issue" : [{ // R!  A single issue associated with the action
    "severity" : "<code>", // R!  fatal | error | warning | information
    "code" : "<code>", // R!  Error or warning code
    "details" : { CodeableConcept }, // Additional details about the error
    "diagnostics" : "<string>", // Additional diagnostic information about the issue
    "location" : ["<string>"] // XPath of element(s) related to issue
  }]
}