FHIRPath Constraints
Constraint - a validation rule that is defined on a profile and described using the FHIRPath syntax.
Constraints allow for describing more complex data requirements.
Example of a profile with a constraint:
resourceType: StructureDefinition
url: http://example.org/fhir/StructureDefinition/patient-profile
name: patient-profile
derivation: constraint
type: Patient
status: active
kind: resource
abstract: false
differential:
element:
- id: Patient
path: Patient
constraint:
- key: patient-data
severity: error
human: Patient's name or address are required
expression: Patient.name.exists() or Patient.address.exists()
In this example, a profile with a constraint is described that checks whether the patient must have either a name or an address specified.
Constraints can be specified for the entire resource and for specific complex and primitive types.
Aidbox FHIR server supports the entire FHIRPath syntax.
See also: FHIR Profiling and Unlocking FHIRPath Power.
