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.
| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
  Quantity | Σ I | 0..* | Element | A measured or measurable amount qty-3: If a code for the unit is present, the system SHALL also be present |
  id | 0..1 | id | xml:id (or equivalent in JSON) | |
 extension | 0..* | Extension | Additional Content defined by implementations | |
 value | Σ | 0..1 | decimal | Numerical value (with implicit precision) |
| comparator | ?! Σ | 0..1 | code | < | <= | >= | > - how to understand the value Binding: http://hl7.org/fhir/ValueSet/quantity-comparator (required) |
| unit | Σ | 0..1 | string | Unit representation |
| system | Σ I | 0..1 | uri | System that defines coded unit form |
 code | Σ | 0..1 | code | Coded form of the unit |
| Documentation for this format | ||||