Open APIs

Hello TMForum community,

I notice a discrepancy between url versioning in the v5 OpenAPI specs for example between: 637 and 640, meaning:

- In 637 we have:

servers:
  - url: 'https://serverRoot'

- In 640 we have:

servers:
  - url: '{apiRoot}/tmf-api/serviceActivationAndConfiguration/v5'
    variables:
      apiRoot:
        default: 'http://serverRoot'
        enum:
          - 'http://serverRoot'

In fact most apis follow 640 approach, could you describe the reasoning? 

Thanks,

Nuno