description: '**This extension is only used in the QI-Core Implementation Guide''s Profile StructureDefinition elements.** It flags elements that the quality improvement community has identified as significant to express the full intent of measures or decision support artifacts. See the [MustSupport Flag](index.html#mustsupport-flag) section in this IG for more information.'
package_name: rs/hl7.fhir.us.qicore
derivation: constraint
name: QICORE_KeyElement
type: Extension
elements:
  url:
    pattern: {type: uri, value: 'http://hl7.org/fhir/us/qicore/StructureDefinition/qicore-keyelement'}
    type: uri
    index: 0
  value:
    choices: [valueBoolean]
    index: 2
  valueBoolean: {type: boolean, choiceOf: value, index: 3}
package_version: 7.0.0-ballot
class: extension
kind: complex-type
url: http://hl7.org/fhir/us/qicore/StructureDefinition/qicore-keyelement
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 7.0.0-ballot
required: [value, valueBoolean]