http://hl7.org/fhir/StructureDefinition/operationoutcome-issue-col|5.2.0

Identifies the source column for the issue.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/string