{description: The cross-version extensions available in FHIR R4B from FHIR R3, package_name: hl7.fhir.uv.xver-r3.r4b, name: Hl7_fhir_uv_xver_r3_r4b, type: null, package_version: 0.0.1-snapshot-2, class: unknown, kind: null, url: 'http://hl7.org/fhir/3.0/ImplementationGuide/hl7.fhir.uv.xver-r3.r4b', version: 0.0.1-snapshot-2}