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# symbologies

The barcode symbologies that the request detects in an image.

```
var symbologies: [VNBarcodeSymbology] { get set }
```

## Discussion

By default, a request scans for all symbologies. Specify a subset of symbologies to limit the request’s detection range.

> Note:
> Setting a revision on the request resets the symbologies to all symbologies for the specified revision.

---

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