Generated Narrative: StructureDefinition questionnaire-constraint Name Flags Card. Type Description & Constraints Extension 0..* Extension Constraint #xD; Slices for extension Content/Rules for all slices #xD; extension:key 1..1 Extension Unique identifier #xD; extension 0..0 Extension #xD; url 1..1 uri "key" #xD; value[x] 1..1 id Value of extension #xD; extension:requirements 0..1 Extension Why needed #xD; extension 0..0 Extension #xD; url 1..1 uri "requirements" #xD; value[x] 1..1 string Value of extension #xD; extension:severity 1..1 Extension error|warning #xD; extension 0..0 Extension #xD; url 1..1 uri "severity" #xD; value[x] 1..1 code Value of extension Binding: ConstraintSeverity (required): How important the invariant is. #xD; extension:expression 1..1 Extension Formal rule #xD; extension 0..0 Extension #xD; url 1..1 uri "expression" #xD; value[x] 1..1 string Value of extension #xD; extension:human 1..1 Extension Human-readable rule #xD; extension 0..0 Extension #xD; url 1..1 uri "human" #xD; value[x] 1..1 string Value of extension #xD; extension:location 0..* Extension Relative path to elements #xD; extension 0..0 Extension #xD; url 1..1 uri "location" #xD; value[x] 1..1 string Value of extension #xD; url 1..1 uri "http://hl7.org/fhir/StructureDefinition/questionnaire-constraint" #xD; value[x] 0..0 Value of extension #xD; Documentation for this format
Use the `targetConstraint` extension instead. An invariant that must be satisfied before responses to the questionnaire can be considered "complete"
DEPRECATED: Use the `targetConstraint` extension instead. An invariant that must be satisfied before responses to the questionnaire can be considered "complete".
An invariant that must be satisfied before responses to the questionnaire can be considered "complete".
This maps to the ElementDefinition.constraint element. See additional guidance and examples in the [SDC implementation guide](http://hl7.org/fhir/uv/sdc/2025Jan/behavior.html#constraint).
All FHIR elements must have a @value or children
hasValue() or (children().count() > id.count())
Must have either extensions or value[x], not both
Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Extensions are always sliced by (at least) url
Additional content defined by implementations
May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Unique id for the constraint within the questionnaire.
Source of the definition for the extension code - a logical name or a URL.
The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Value of extension - must be one of a constrained set of the data types (see [Extensibility](http://hl7.org/fhir/R5/extensibility.html) for a list).
An explanation of why this extension is required (for documentation purposes).
Indicates how serious violating the invariant is.
The FHIRPath expression of the rule for computable interpretation.
A free text expression of the rule to display to the user if the rule is violated.
Relative paths to the questions this rule is enforced against.