This code system http://hl7.org/fhir/linkage-type defines the following codes:

CodeDisplayDefinition
sourceSource of truthThe record represents the "source of truth" (from the perspective of this Linkage resource) for the underlying event/condition/etc.
alternateAlternate recordThe record represents the alternative view of the underlying event/condition/etc. The record may still be actively maintained, even though it is not considered to be the source of truth.
historicalHistorical/obsolete recordThe record represents an obsolete record of the underlyng event/condition/etc. It is not expected to be actively maintained.

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