description: Represents the definition of a group of subjects, suitable for use in various contexts, such as a cohort definition, a recommendation inclusion or exclusion criteria, the members of a study, or a population criteria package_name: hl7.fhir.uv.cpg.r4b derivation: constraint name: CPGGroupDefinition type: Group elements: name: {mustSupport: true, index: 7} type: pattern: {type: Code, value: person} mustSupport: true index: 4 member: {index: 9} characteristic: {mustSupport: true, index: 8} extension: index: 0 slicing: rules: open ordered: false discriminator: - {path: url, type: value} min: null slices: expression: match: {url: null} schema: {type: Extension, mustSupport: true, url: 'http://hl7.org/fhir/StructureDefinition/cqf-expression', index: 1} min: 0 max: 1 active: {mustSupport: true, index: 3} code: {mustSupport: true, index: 6} identifier: {mustSupport: true, index: 2} actual: mustSupport: true pattern: {type: Boolean, value: false} index: 5 package_version: 2.0.0-ballot extensions: expression: {url: 'http://hl7.org/fhir/StructureDefinition/cqf-expression', min: 0, max: 1, type: Extension, mustSupport: true, index: 1} class: profile kind: resource url: http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-groupdefinition base: http://hl7.org/fhir/StructureDefinition/Group version: 2.0.0-ballot required: [name]