Generated Narrative: StructureDefinition cqf-targetInvariant Name Flags Card. Type Description & Constraints Extension 0..* Extension A constraint on the target resource #xD; Slices for extension Content/Rules for all slices #xD; extension:key 1..1 Extension Unique identifier #xD; extension 0..0 #xD; url 1..1 uri "key" #xD; value[x] 1..1 id Value of extension #xD; extension:requirements 0..1 Extension Why the invariant is defined #xD; extension 0..0 #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 #xD; url 1..1 uri "severity" #xD; value[x] 1..1 code Value of extension Binding: ConstraintSeverity (required) #xD; extension:expression 1..1 Extension The invariant expression #xD; extension 0..0 #xD; url 1..1 uri "expression" #xD; value[x] 1..1 Expression Value of extension #xD; url 1..1 uri "http://hl7.org/fhir/StructureDefinition/cqf-targetInvariant" #xD; value[x] 0..0 #xD; Documentation for this format
Use the `targetConstraint` extension instead. Specifies an invariant that is enforced on instantiated resources. This extension can be applied to any element of a definitional resource (such as ActivityDefinition or Measure) and indicates that the invariant should be enforced on resources that are instantiated from the definition. For example, this extension can be used to define a constraint such as `numerator count must be less than or equal to denominator count`
HL7 International / Clinical Decision Support
DEPRECATED: Use the `targetConstraint` extension instead. Specifies an invariant that is enforced on instantiated resources. This extension can be applied to any element of a definitional resource (such as ActivityDefinition or Measure) and indicates that the invariant should be enforced on resources that are instantiated from the definition. For example, this extension can be used to define a constraint such as `numerator count must be less than or equal to denominator count`.
This extension allows invariants to be specified as part of definitional resources as an alternative to having to define a profile to enforce the constraint.
Specifies an invariant that is enforced in the context of an instantiated resource.
Can be used on any definitional artifact to define an invariant that is enforced in the context of an instantiated resource. The invariant expression will have access to `%target` and `%definition` variables, where target is the instantiated resource, and definition is the definition used to instantiate.
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.
A unique identifier for the invariant (unique in the context of the resource).
Any error or outcome messages or warnings should include this id to allow the source of the message to be determined.
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).
A brief description of why the invariant is necessary or appropriate.
Whether the invariant indicates an error condition or a warning.
SHALL applications comply with this constraint?
An expression providing a formal representation of the invariant condition.
The expression will have access to `%target` (the resource that was instantiated) and `%definition` (the definition for the instantiated resource).