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 |
|---|---|---|---|---|
  MessageHeader | Σ | 0..* | DomainResource | A resource that describes a message that is exchanged between systems |
  id | Σ | 0..1 | id | Logical id of this artifact |
| meta | Σ | 0..1 | Meta | Metadata about the resource |
| implicitRules | ?! Σ | 0..1 | uri | A set of rules under which this content was created |
| language | 0..1 | code | Language of the resource content Binding: http://tools.ietf.org/html/bcp47 (required) | |
| text | I | 0..1 | Narrative | Text summary of the resource, for human interpretation |
| contained | 0..* | Resource | Contained, inline Resources | |
 extension | 0..* | Extension | Additional Content defined by implementations | |
| modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored |
| timestamp | Σ | 1..1 | instant | Time that the message was sent |
| event | ?! Σ | 1..1 | Coding | Code for the event this message represents Binding: http://hl7.org/fhir/ValueSet/message-events (preferred) |
 response | ?! Σ | 0..1 | BackboneElement | If this is a reply to prior message |
 id | 0..1 | id | xml:id (or equivalent in JSON) | |
| extension | 0..* | Extension | Additional Content defined by implementations | |
| modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored |
| identifier | Σ | 1..1 | id | Id of original message |
| code | ?! Σ | 1..1 | code | ok | transient-error | fatal-error Binding: http://hl7.org/fhir/ValueSet/response-code (required) |
  details | Σ | 0..1 | Reference(OperationOutcome) | Specific list of hints/warnings/errors |
| source | Σ | 1..1 | BackboneElement | Message Source Application |
| id | 0..1 | id | xml:id (or equivalent in JSON) | |
| extension | 0..* | Extension | Additional Content defined by implementations | |
| modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored |
| name | Σ | 0..1 | string | Name of system |
| software | Σ | 0..1 | string | Name of software running the system |
| version | Σ | 0..1 | string | Version of software running |
| contact | Σ | 0..1 | ContactPoint | Human contact for problems |
| endpoint | Σ | 1..1 | uri | Actual message source address or id |
| destination | Σ | 0..* | BackboneElement | Message Destination Application(s) |
| id | 0..1 | id | xml:id (or equivalent in JSON) | |
| extension | 0..* | Extension | Additional Content defined by implementations | |
| modifierExtension | ?! | 0..* | Extension | Extensions that cannot be ignored |
| name | Σ | 0..1 | string | Name of system |
| target | Σ | 0..1 | Reference(Device) | Particular delivery destination within the destination |
| endpoint | Σ | 1..1 | uri | Actual destination address or id |
| enterer | Σ | 0..1 | Reference(Practitioner) | The source of the data entry |
| author | Σ | 0..1 | Reference(Practitioner) | The source of the decision |
| receiver | Σ | 0..1 | Reference(Practitioner | Organization) | Intended "real-world" recipient for the data |
| responsible | Σ | 0..1 | Reference(Practitioner | Organization) | Final responsibility for event |
| reason | Σ | 0..1 | CodeableConcept | Cause of event Binding: http://hl7.org/fhir/ValueSet/message-reason-encounter (example) |
| data | Σ | 0..* | Reference(Resource) | The actual content of the message |
| Documentation for this format | ||||