in: query

name: before/after

required: false

description: >
  `before` and `after` are both optional but only one of them can be in the
  query at a time.

schema:
  allOf:
    - type: object
      properties:
        before:
          type: string
          description: >
            A reference to a list entry used for paginating to the previous set
            of entries. This field is pre-populated in the `previous_url` field
            in the return response.
        after:
          type: string
          description: >
            A reference to a list entry used for paginating to the next set
            of entries. This field is pre-populated in the `next_url` field
            in the return response.
    - oneOf:
        - required:
            - before
        - required:
            - after