http://hl7.org/fhir/StructureDefinition/UsageContext|4.0.1

Base StructureDefinition for UsageContext Type: Specifies clinical/business/etc. metadata that can be used to retrieve, index and/or categorize an artifact. This metadata can either be specific to the applicable population (e.g., age category, DRG) or the specific context of care (e.g., venue, care setting, provider of care).