A clinician may need to refer to a body structure that is the union of several coded structures. For example, the middle and lower lobes of the right lung (72481006 and 266005) might be collectively the target of radiation therapy. While it is possible to describe this using two separate BodyStructure resources, the two lobes of the lung together are the target of the therapy, and it is unnatural to describe the dose or technique of the treatment for each separately. There are many examples of procedure on adjacent structures. To permit this, suggest reformulating location and locationQualifier as a 0..* backbone element containing 1..1 location and 0..* locationQualifiers.