This code system http://hl7.org/fhir/resource-aggregation-mode defines the following codes:

LvlCodeDisplayDefinition
1containedContainedThe reference is a local reference to a contained resource.
1referencedReferencedThe reference to a resource that has to be resolved externally to the resource that includes the reference.
2  bundledBundledThe resource the reference points to will be found in the same bundle as the resource that includes the reference.

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