http://hl7.org/fhir/StructureDefinition/procedure-directedBy|5.2.0

The target of the extension is a distinct actor from the requester and has decision-making authority over the service and takes direct responsibility to manage the service.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/CodeableConcept
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/Reference
Extension.value[x].targetProfilehttp://hl7.org/fhir/StructureDefinition/Patient
Extension.value[x].targetProfilehttp://hl7.org/fhir/StructureDefinition/RelatedPerson
Extension.value[x].targetProfilehttp://hl7.org/fhir/StructureDefinition/Practitioner
Extension.value[x].targetProfilehttp://hl7.org/fhir/StructureDefinition/PractitionerRole