http://hl7.org/fhir/StructureDefinition/valueset-trusted-expansion|5.2.0

A trusted FHIR terminology server endpoint (the [base] url of the FHIR server) where an expansion of the valueset may be performed.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/url