Implementation Guide
Telematikinfrastruktur (TI) Common
Version 1.2.0 - release

## Extension: Base URL der FHIR-API

Official URL: https://gematik.de/fhir/ti/StructureDefinition/extension-base-url | Version: 1.1.1
Active as of 2025-09-12 | Computable Name: BaseUrl
Copyright/Legal: gematik GmbH / Dieses Artefakt ist lizenziert unter Apache License, Version 2.0.

Gibt die Basis-URL des FHIR-Servers als Zeichenkette an. Beispiel: http://epa4all/epa/medication/api/v1/fhir

Context of Use

This extension may be used on the following element(s):

- Element ID CapabilityStatement
- Element ID Endpoint
- Element ID ImplementationGuide

Usage info

Usages:

- Use this Extension: Capability Statement Profil für TI FHIR Data Service

You can also check for usages in the FHIR IG Statistics

### Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

- Text Summary
- Differential Table
- Snapshot Table
- All

This structure is derived from Extension

Summary

Simple Extension with the type string: Gibt die Basis-URL des FHIR-Servers als Zeichenkette an. Beispiel: http://epa4all/epa/medication/api/v1/fhir

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Base URL der FHIR-API
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "https://gematik.de/fhir/ti/StructureDefinition/extension-base-url"
value[x] |  | 0..1 | string | Die Base-URL, z.B. http://epa4all/epa/medication/api/v1/fhir
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Base URL der FHIR-API
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "https://gematik.de/fhir/ti/StructureDefinition/extension-base-url"
value[x] |  | 0..1 | string | Die Base-URL, z.B. http://epa4all/epa/medication/api/v1/fhir
Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type string: Gibt die Basis-URL des FHIR-Servers als Zeichenkette an. Beispiel: http://epa4all/epa/medication/api/v1/fhir

Differential View

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Base URL der FHIR-API
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "https://gematik.de/fhir/ti/StructureDefinition/extension-base-url"
value[x] |  | 0..1 | string | Die Base-URL, z.B. http://epa4all/epa/medication/api/v1/fhir
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Base URL der FHIR-API
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "https://gematik.de/fhir/ti/StructureDefinition/extension-base-url"
value[x] |  | 0..1 | string | Die Base-URL, z.B. http://epa4all/epa/medication/api/v1/fhir
Documentation for this format

Other representations of profile: CSV, Excel, Schematron

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`