description: This cross-version extension represents ResearchStudy.enrollment from http://hl7.org/fhir/StructureDefinition/ResearchStudy|4.0.1 for use in FHIR R5. package_name: rs/hl7.fhir.uv.xver derivation: constraint name: ext_R4_ResearchStudy_enrollment type: Extension elements: value: base: {path: 'Extension.value[x]'} short: Inclusion & exclusion criteria choices: [valueReference] index: 1 valueReference: short: Inclusion & exclusion criteria refers: ['http://hl7.org/fhir/StructureDefinition/Group'] type: Reference base: {path: 'Extension.value[x]'} choiceOf: value index: 2 url: pattern: {type: uri, value: 'http://hl7.org/fhir/4.0/StructureDefinition/extension-ResearchStudy.enrollment'} type: uri index: 3 package_version: r4.r5-0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/4.0/StructureDefinition/extension-ResearchStudy.enrollment base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]