http://hl7.org/fhir/StructureDefinition/targetConstraint|5.2.0

Specifies a constraint that is enforced on instantiated (or target) resources. This extension can be applied to definitional resources (such as ActivityDefinition or Measure) and indicates that the constraint 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`.

Structure JSON Dependencies FHIRSchema Other Versions Dependant (0)Elements Summary

Name	Card	Type	Description & Constraints
Extension	0..*		A constraint on the target resource
extension *	1..1	Extension	Unique identifier
extension	?..0
url	?..?	uri
value[x] *	1..?
valueId *	1..?	id
extension	0..1	Extension	Why the constraint is defined
extension	?..0
url	?..?	uri
value[x] *	1..?
valueMarkdown *	1..?	markdown
extension *	1..1	Extension	error \| warning
extension	?..0
url	?..?	uri
value[x] *	1..?		ConstraintSeverity (required)
valueCode *	1..?	code	ConstraintSeverity (required)
extension *	1..1	Extension	The invariant expression
extension	?..0
url	?..?	uri
value[x] *	1..?
valueExpression *	1..?	Expression
extension *	1..1	Extension	Human-readable rule
extension	?..0
url	?..?	uri
value[x] *	1..?
valueString *	1..?	string
extension	0..*	Extension	Relative path to elements
extension	?..0
url	?..?	uri
value[x] *	1..?
valueString *	1..?	string
url	?..?
value[x]	0..0