要提供一个按标签分隔的OpenApi定义并包含代码示例，可以按照以下步骤进行：

1. 在OpenApi定义文件中使用tags关键字来定义标签。例如：

tags:
  - name: users
    description: Operations related to users
  - name: products
    description: Operations related to products

2. 在每个路径（endpoint）上使用tags属性将其与相应的标签关联起来。例如：

paths:
  /users:
    get:
      tags:
        - users
      summary: Get a list of users
      ...
  /products:
    get:
      tags:
        - products
      summary: Get a list of products
      ...

3. 针对每个标签，定义一个以标签名为键的对象，其中包含该标签下的所有路径和操作。可以将这些对象组织在一个paths对象中。例如：

paths:
  /users:
    get:
      tags:
        - users
      summary: Get a list of users
      ...

  /users/{id}:
    get:
      tags:
        - users
      summary: Get a user by ID
      ...

  /products:
    get:
      tags:
        - products
      summary: Get a list of products
      ...

  /products/{id}:
    get:
      tags:
        - products
      summary: Get a product by ID
      ...

4. 可以在每个标签下定义一些公共的参数、请求体或响应模板，以便在路径中引用。例如：

tags:
  - name: users
    description: Operations related to users
    externalDocs:
      description: Find out more about users
      url: https://example.com/users

  - name: products
    description: Operations related to products

paths:
  /users:
    get:
      tags:
        - users
      summary: Get a list of users
      parameters:
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          $ref: '#/components/responses/userList'

  /products:
    get:
      tags:
        - products
      summary: Get a list of products
      parameters:
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          $ref: '#/components/responses/productList'

5. 可以在OpenApi定义文件中的其他部分，例如components部分，定义公共的参数、请求体、响应模板等，然后在路径中引用它们。这样可以避免重复定义。例如：

components:
  parameters:
    limit:
      name: limit
      in: query
      description: The maximum number of items to return
      required: false
      schema:
        type: integer
        format: int32
        default: 10

  responses:
    userList:
      description: A list of users
      content:
        application/json:
          schema:
            type: array
            items:
              $ref: '#/components/schemas/user'

    productList:
      description: A list of products
      content:
        application/json:
          schema:
            type: array
            items:
              $ref: '#/components/schemas/product'

  schemas:
    user:
      type: object
      properties:
        id:
          type: integer
        name:
          type: string

    product:
      type: object
      properties:
        id:
          type: integer
        name:
          type: string

通过以上步骤，你可以创建一个按标签分隔的OpenApi定义，并包含代码示例。这样可以更好地组织和管理API定义，并提供更好的可读性和可维护性。