{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "PlannerExternalReference",
  "type": "object",
  "description": "An external reference attached to a Planner task",
  "properties": {
    "@odata.type": {
      "type": "string"
    },
    "alias": {
      "type": "string",
      "description": "A name alias for the reference"
    },
    "lastModifiedDateTime": {
      "type": "string",
      "description": "The date and time the reference was last modified"
    },
    "previewPriority": {
      "type": "string",
      "description": "Hint used to set the relative priority order in which the reference will be shown as a preview on the task"
    },
    "type": {
      "type": "string",
      "description": "The type of the reference (e.g., PowerPoint, Word, Excel, Other)"
    }
  }
}