title: policy.yaml
type: object
required: [ signature, rules ]
properties:
  signature:
    type: string
  rules:
    type: array
    items:
      type: object
      required: [ type, entity ]
      allOf:
      - oneOf:
        - properties:
            type: { type: string, const: m.room }
            entity: { type: string, pattern: '^![\w\-]+:.+$' }
        - properties:
            type: { type: string, const: m.user }
            entity: { type: string, pattern: '^@[\w\-]+:.+$' }
      - oneOf:
        - required: [ tag ]
          properties:
            tag: { type: string, pattern: ^\w+$ }
        - required: [ tags ]
          properties:
            tags:
              type: array
              items: [ { type: string, pattern: ^\w+$ } ]