Add example of split API specifications with relative references

Store the API in one file, the schema definitions in another file

examples/splitspecs/README.rst

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+===================
+Split Specs Example
+===================
+
+This example demonstrates split specifications and relative references.
+The OpenAPI specification and the Swagger specification are stored in
+multiple files and use references that are resolved by Connexion.
+
+Preparing
+---------
+
+Create a new virtual environment and install the required libraries
+with these commands:
+
+.. code-block:: bash
+    $ python -m venv my-venv
+    $ source my-venv/bin/activate
+    $ pip install 'connexion[flask,swagger-ui,uvicorn]>=3.1.0'
+
+Running
+-------
+
+Launch the connexion server with this command:
+
+Running:
+
+.. code-block:: bash
+
+    $ python app.py
+
+Now open your browser and view the Swagger UI for these specification files:
+
+* http://localhost:8080/openapi/ui/ for the OpenAPI 3 spec
+* http://localhost:8080/swagger/ui/ for the Swagger 2 spec

examples/splitspecs/app.py

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+from pathlib import Path
+
+import connexion
+
+pets = {
+    1: {"name": "Aldo", "registered": "2022-11-28T00:00:00Z"},
+    2: {"name": "Bailey", "registered": "2023-11-28T11:11:11Z"},
+    3: {"name": "Hugo", "registered": "2024-11-28T22:22:22Z"},
+}
+
+
+def get(petId):
+    id_ = int(petId)
+    if pets.get(id_) is None:
+        return connexion.NoContent, 404
+    return pets[id_]
+
+
+def show():
+    # NOTE: we need to wrap it with list for Python 3 as dict_values is not JSON serializable
+    return list(pets.values())
+
+
+app = connexion.FlaskApp(__name__, specification_dir="spec/")
+app.add_api("openapi.yaml", arguments={"title": "Pet Store Rel Ref Example"})
+app.add_api("swagger.yaml", arguments={"title": "Pet Store Rel Ref Example"})
+
+
+if __name__ == "__main__":
+    app.run(f"{Path(__file__).stem}:app", port=8080)

examples/splitspecs/spec/components.yaml

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+components:
+  schemas:
+    Pet:
+      required:
+        - name
+      properties:
+        id:
+          type: integer
+          format: int64
+          readOnly: true
+          example: 1
+        name:
+          type: string
+          example: fluffy
+        registered:
+          type: string
+          readOnly: true
+          example: 2019-01-16T23:52:54Z
+
+    Pets:
+      type: array
+      items:
+        $ref: "#/components/schemas/Pet"
+
+    Error:
+      properties:
+        code:
+          type: integer
+          format: int32
+        message:
+          type: string
+      required:
+        - code
+        - message

examples/splitspecs/spec/definitions.yaml

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+definitions:
+  Pet:
+    type: object
+    required:
+      - name
+    properties:
+      id:
+        type: integer
+        format: int64
+        example: 1
+      name:
+        type: string
+        example: fluffy
+      registered:
+        type: string
+        format: date-time
+        example: 2019-01-16T23:52:54Z
+
+  Pets:
+    type: array
+    items:
+      $ref: "#/definitions/Pet"
+
+  Error:
+    type: object
+    properties:
+      code:
+        type: integer
+        format: int32
+      message:
+        type: string
+    required:
+      - code
+      - message
+

examples/splitspecs/spec/openapi.yaml

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+openapi: 3.0.0
+
+info:
+  version: 1.0.0
+  title: Swagger Petstore
+  license:
+    name: MIT
+
+servers:
+  - url: /openapi
+
+paths:
+  /pets:
+    get:
+      summary: List all pets
+      operationId: app.show
+      responses:
+        '200':
+          description: A list of pets
+          content:
+            application/json:
+              schema:
+                $ref: "components.yaml#/components/schemas/Pets"
+        default:
+          description: Unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "components.yaml#/components/schemas/Error"
+
+  '/pets/{petId}':
+    get:
+      summary: Info for a specific pet
+      operationId: app.get
+      parameters:
+        - name: petId
+          in: path
+          description: Id of the pet to get.
+          required: true
+          schema:
+            type: integer
+          example: 1
+      responses:
+        '200':
+          description: Expected response to a valid request
+          content:
+            application/json:
+              schema:
+                $ref: "components.yaml#/components/schemas/Pet"
+        default:
+          description: Unexpected error
+          content:
+            application/json:
+              schema:
+                $ref: "components.yaml#/components/schemas/Error"

examples/splitspecs/spec/swagger.yaml

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+swagger: "2.0"
+
+info:
+  title: "{{title}}"
+  version: "1.0"
+
+basePath: /swagger
+
+paths:
+  /pets:
+    get:
+      summary: List all pets
+      operationId: app.show
+      responses:
+        '200':
+          description: List all pets
+          schema:
+            type: array
+            items:
+              $ref: 'definitions.yaml#/definitions/Pets'
+        default:
+          description: Unexpected Error
+          schema:
+            $ref:  'definitions.yaml#/definitions/Error'
+
+  '/pets/{petId}':
+    get:
+      summary: Info for a specific pet
+      operationId: app.get
+      parameters:
+        - name: petId
+          in: path
+          required: true
+          type: integer
+          minimum: 1
+          description: Parameter description in Markdown.
+      responses:
+        '200':
+          description: Expected response to a valid request
+          schema:
+            $ref: 'definitions.yaml#/definitions/Pet'
+        default:
+          description: Unexpected Error
+          schema:
+            $ref:  'definitions.yaml#/definitions/Error'