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

Lvl | Code | Display | Definition
1 | contained | Contained | The reference is a local reference to a contained resource.
1 | referenced | Referenced | The reference to a resource that has to be resolved externally to the resource that includes the reference.
2 | bundled | Bundled | When the resource is in a Bundle, the resource the reference points to will be found in the same bundle as the resource that includes the reference.

# description
How resource references can be aggregated.

# concept[].definition
The reference is a local reference to a contained resource.

# concept[].definition
The reference to a resource that has to be resolved externally to the resource that includes the reference.

# concept[].concept[].definition
When the resource is in a Bundle, the resource the reference points to will be found in the same bundle as the resource that includes the reference.