{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/PlannerExternalReference",
  "title": "PlannerExternalReference",
  "type": "object",
  "description": "An external reference attached to a Planner task",
  "properties": {
    "@odata.type": {
      "type": "string",
      "const": "microsoft.graph.plannerExternalReference",
      "example": "example_value"
    },
    "alias": {
      "type": "string",
      "description": "A name alias for the reference",
      "example": "example_value"
    },
    "lastModifiedBy": {
      "$ref": "#/components/schemas/IdentitySet",
      "readOnly": true
    },
    "lastModifiedDateTime": {
      "type": "string",
      "format": "date-time",
      "description": "The date and time the reference was last modified",
      "readOnly": true,
      "example": "2026-01-15T10:30:00Z"
    },
    "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",
      "example": "example_value"
    },
    "type": {
      "type": "string",
      "description": "The type of the reference (e.g., PowerPoint, Word, Excel, Other)",
      "example": "example_value"
    }
  }
}