description: A set of colon delimited codes that control the execution of specific valdation rules for date(/time) elements. The code ```tz-for-time``` controls whether the rule that there must be a timezone if there's a time is enforced - in it's absence, the rule is not enforced. The code ```year-valid``` controls whether the year is checked for being in the range 1800 -> now + 80 year - in it's absence, the rule is not enforced. If the extension is not present, the rules are enforced. This extension has no effect on data types and resources, only in logical models
package_name: hl7.fhir.uv.tools.r5
derivation: constraint
name: DateRulesControl
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/tools/StructureDefinition/elementdefinition-date-rules'}
    index: 1
  value:
    choices: [valueString]
    index: 3
  valueString: {type: string, choiceOf: value, index: 4}
package_version: 0.4.0
extensions: {}
class: extension
kind: complex-type
url: http://hl7.org/fhir/tools/StructureDefinition/elementdefinition-date-rules
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 0.4.0
required: [valueString, value]