<!--
{
  "availability" : [
    "macOS: 26.0.0 -",
    "visionOS: 26.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CompositorServices",
  "identifier" : "/documentation/CompositorServices/LayerRenderer/Drawable/TrackingArea/Identifier-swift.struct/invalid",
  "metadataVersion" : "0.1.0",
  "role" : "Type Property",
  "symbol" : {
    "kind" : "Type Property",
    "modules" : [
      "Compositor Services",
      "CompositorServices"
    ],
    "preciseIdentifier" : "s:So27cp_tracking_area_identifiera18CompositorServicesE7invalidABvpZ"
  },
  "title" : "invalid"
}
-->

# invalid

Identifier reserved as invalid.

```
static let invalid: LayerRenderer.Drawable.TrackingArea.Identifier
```

## Discussion

Should not be used as identifier for [`addTrackingArea(identifier:)`](/documentation/CompositorServices/LayerRenderer/Drawable/addTrackingArea(identifier:)).

---

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