title: fragment/common
description: Common schema fields for event schemas
$id: /fragment/common/1.0.0
$schema: 'https://json-schema.org/draft-07/schema#'
type: object
properties:
  $schema:
    type: string
    description: >
      A URI identifying the JSONSchema for this event. This should match an
      schema's $id in a schema repository. E.g. /schema/title/1.0.0
  meta:
    type: object
    required:
      - dt
      - stream
    properties:
      uri:
        type: string
        format: uri-reference
        maxLength: 8192
        description: Unique URI identifying the event or entity
      request_id:
        type: string
        description: Unique ID of the request that caused the event
      id:
        type: string
        description: Unique ID of this event
      dt:
        type: string
        format: date-time
        maxLength: 128
        description: 'UTC event datetime, in ISO-8601 format'
      domain:
        type: string
        description: Domain the event or entity pertains to
        minLength: 1
      stream:
        type: string
        description: Name of the stream/queue/dataset that this event belongs in
        minLength: 1
required:
  - $schema
  - meta