Lookup for FHIR R3 UsageContext for use in FHIR R5

Source ElementUsageTarget
UsageContext.idUseElementSameNameUsageContext.id
UsageContext.extensionUseElementSameNameUsageContext.extension
UsageContext.codeUseElementSameNameUsageContext.code
UsageContext.value[x]UseElementSameNameUsageContext.value[x]