# AddObjectClassMetadata

Adds custom metadata (a key-value pair) to an object class.

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`recognizer` | The name of the recognizer that contains the class. | Yes
`identifier` | The identifier of the class that you want to add metadata to. | Yes
`key` | The key to add (maximum 254 bytes). | Yes
`value` | The value to add (maximum 254 bytes). | Yes

## Example

The following example adds metadata to a class:

    /action=AddObjectClassMetadata&recognizer=RoadScene
                                  &identifier=car
                                  &key=key
                                  &value=value

## Response

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

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