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]/ServiceDefinition/[id]/$data-requirements
Parameters (In)
| Name | Cardinality | Type | Documentation |
| evaluateAtDateTime | 0..1 | DateTime | An optional date and time specifying that the evaluation should be performed as though it was the given date and time. Data requirements returned will use this as the "Now" point for the purposes of determining the data requirements. |
Return Values (Out)
| Name | Cardinality | Type | Documentation |
| return | 1..1 | Library | The result of the requirements gathering is a module-definition Library that describes the aggregate parameters, data requirements, and dependencies of the service. |
The effect of invoking this operation is to determine the aggregate set of data requirements and dependencies for the service module. The result is a Library resource with a type of module-definition that contains all the parameter definitions and data requirements of the service module and any libraries referenced by it. Implementations SHOULD aggregate data requirements intelligently (i.e. by collapsing overlapping data requirements).