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# NFCISO15693TagResponseErrorKey

A user information dictionary key indicating that a tag responded with a command error.

```
let NFCISO15693TagResponseErrorKey: String
```

## Discussion

Check for the presence of this key in the <doc://com.apple.documentation/documentation/Foundation/NSError/userInfo> dictionary of an <doc://com.apple.documentation/documentation/Foundation/NSError> object to determine whether a tag responded with a command error. When a command error occurs, the <doc://com.apple.documentation/documentation/Foundation/NSError/code> property contains an error code defined in the ISO15693-3 specification.

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