A reference to a stored contraindication that is the basis for this issue. A recipient can expect that the item referenced in this extension is being retained for record keeping purposes.

Operation Outcome records are transient items that are returned in response to specific interactions or operations. Contraindications are items that can be stored in the paitient's records as reasons that things were not done (or done). This extensions allows a transient operation outcome to refer to a persistent entry in the patient record as the basis for the outcome.

unique id for the element within a resource (for internal references).

An Extension

Source of the definition for the extension code - a logical name or a URL.

The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition should be version specific. This will ideally be the URI for the Resource Profile defining the extension, with the code for the extension after a #.

Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).