http://hl7.org/fhir/StructureDefinition/workflow-relatedArtifact|4.0.1

Documentation or 'knowledge artifacts' relevant to the base resource such as citations, supporting evidence, documentation of processes, caveats around testing methodology.
element_idtypes
Extension
Extension.extension
Extension.url
Extension.value[x]
Extension
Extension.id
Extension.extension
Extension.url
Extension.value[x]