Is it possible to reference query parameter to enum defined in `definitions` ? For example consider following example: ``` yaml paths: /users/test: get: summary: Test endpoint parameters: - name: osType in: query description: Client's OS type. required: true type: string enum: - ios - android ``` then I define this ``` yaml definitions: OsTypes: type: string enum: - ios - android ``` Can I reference it from endpoint to avoid defining allowed values of the enum in every endpoint that uses it ? I tried ``` yaml schema: $ref: '#/definitions/OsTypes' ``` Thanks!