FQL is a query language that allows you to retrieve, filter and project data from any data source containing FHIR Resources. It brings the power of three existing languages together: SQL, JSON and FhirPath. It allows you to create tables and is useful for gaining insight and perform quality control.
Invocations
URL: [base]/$data-requirements
URL: [base]/Library/[id]/$data-requirements
Parameters (In)
| Name | Cardinality | Type | Documentation |
| target | 0..1 | Reference | The target of the data requirements operation |
Return Values (Out)
| Name | Cardinality | Type | Documentation |
| return | 1..1 | Library | The result of the requirements gathering |
The effect of invoking this operation is to determine the aggregate set of data requirements and dependencies for a given target resource. The result is a Library resource with a type of module-definition that contains all the parameter definitions and data requirements of the target resource and any libraries referenced by it. Implementations SHOULD aggregate data requirements intelligently (i.e. by collapsing overlapping data requirements)