# description
Used to distinguish different roles a resource can play within a set of linked resources.

# concept[].definition
The resource represents the "source of truth" (from the perspective of this Linkage resource) for the underlying event/condition/etc.

# concept[].definition
The resource represents an alternative view of the underlying event/condition/etc.  The resource may still be actively maintained, even though it is not considered to be the source of truth.

# concept[].definition
The resource represents an obsolete record of the underlying event/condition/etc.  It is not expected to be actively maintained.