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# UpdateDetectionClassMetadata

Updates the value of a key-value pair in the custom metadata of a class.

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`detector` | The name of the object detector that contains the class. | Yes
`identifier` | The identifier of the class for which you want to update metadata. | Yes
`key` | The key of the key-value pair to update. | Yes
`newvalue` | The new value (maximum 254 bytes). | Yes

## Example

    /action=UpdateDetectionClassMetadata&detector=roadscene
                                        &identifier=car
                                        &key=key
                                        &newvalue=newvalue

## Response

    <autnresponse>
      <action>UPDATEDETECTIONCLASSMETADATA</action>
      <response>SUCCESS</response>
      <responsedata></responsedata>
    </autnresponse>

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