http://hl7.org/fhir/StructureDefinition/structuredefinition-dependencies|5.2.0

Instances can only be valid against this StructureDefinition, if they also sucessfully validate against the dependent profile identified in this extension.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/canonical
Extension.value[x].targetProfilehttp://hl7.org/fhir/StructureDefinition/StructureDefinition