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+---
+title: TRG 6.02 - API Versioning
+sidebar_position: 1
+---
+
+:::caution
+Proposed release date: "mandatory after": 01st of May 2024
+:::
+
+| Status     | Created      | Post-History                           |
+|------------|--------------|----------------------------------------|
+| Draft      | 30-Nov-2023  | Initial contribution                   |
+
+## Why
+
+For publicly available APIs a versioning mechanism is required, so that all APIs are versioned the same way.
+
+Note that for APIs accessible only via EDC, the API-version is included in the EDC asset and not the URL. This is described in CX-0018.
+
+## What
+
+This TRG applies to all APIs created within Tractus-X, but does not apply where existing standards (e.g. Data Space Protocol) are implemented where contracticting behavoir is required in order to adhere to that standard.
+
+For APIs that are called through an EDC asset, the version information hast to be included as a property in the EDC asset. This needs to be done in accordance with Catena-X standard CX-0018. More information and guidance is available there.
+
+## Description
+
+For public REST-APIs (= called through an EDC aspect), the Version number **must** be included in the URL.
+
+Example:  `https://example.com/api/v2/customers`
+
+A standard **should** offer the following aliases as well (meaning they all answer identically to HTTP requests):
+
+`https://example.com/api/v2.1/customers`
+
+`https://example.com/api/latest/customers`
+
+For the version in the URL, semantic versioning **must** be used.
+
+Old endpoints (that have been offered bevor) and are not supported anymore **should** respond with an appropriate HTTP 30x status code and the new location (URL).
+
+For example, when v3 of an API is released, an request to `https://example.com/api/v2/customers` would return HTTP 301 (moved permanently) and point to `https://example.com/api/v3/customers`
+
+Queries and fragments **may** be used, so the following example is valid:
+
+        https://example.com:443/messaging/v1/messages?textContains=AMG#resultlist
+        \___/   \______________/\___________________/\_______________/ \________/
+          |              |                |                 |             |
+        scheme       authority          path             query        fragment
+
+Note that the structure of the URL needs to be chosen mindfully. For example:
+
+* `https://example.com/api/customers/v2` → this is bad idea since you might want to rename 'customers' to something else in the future
+* `https://example.com/api/customers/` → does not make it clear which version is used. It might be the latest, but some developers might not notice and assume the API is stable for ever
+* `https://example.com/api/v2.4.8/customers/` → not recommended since a patch (according to semantic versioning) is always backward compatible the need for this can be questioned. Adding the patch level to the URL forces clients to frequently to adapt to a new URL.
+
+Further rules and recommendations on URL design:
+
+* It is **recommended** to use nouns over verbs. For example, use `/customers` instead of `/getCustomers/`
+* It is **recommended** to use plural nouns. For example, use `/customers/` instead of `/customer/`
+* It is **recommended** to use the concrete object, not a abstraction. For example, use `/customers/` instead of `/persons/`
+* The technical identifier **should** be part of the path, not the query. For example, use `/customers/12345/` instead of `/customers?key=12345`
+* Only English words **must** be used. For example, use `/customers/` instead of `/kunden/`
+* Camel case **should not** be used in the URI, but it MAY be used in the query or fragment part. For example, use `/vehicleorders/`, `/vehicle-orders/` or `/vehicle_orders/` instead of `/VehicleOrders/`
diff --git a/docs/release/trg-0/trg-0.md b/docs/release/trg-0/trg-0.md
index 077ef444b86f..7cdacb745981 100644
--- a/docs/release/trg-0/trg-0.md
+++ b/docs/release/trg-0/trg-0.md
@@ -6,6 +6,7 @@ title: TRG 0 - Changelog & Drafts
 
 | Created      | Post-History                                                                                  |
 |--------------|-----------------------------------------------------------------------------------------------|
+| 04-Dec-2023  | TRG 6.02 added Draft for TRG API Versioning                                                    |
 | 04-Dec-2023  | TRG 7.06 update Shared UI Components / NPM library                                            |
 | 09-Oct-2023  | TRG 4.06 add base image for hashicorp vault                                                   |
 | 29-Sep-2023  | TRG 4.02 / 06 add Alpine Linux to list of container base images                               |