# AddClassMetadata

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

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`classifier` | The name of the classifier that contains the object class. | Yes
`identifier` | The identifier of the object 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 an object class:

    /action=AddClassMetadata&classifier=vehicles
                             &identifier=6d8e53fd92e601a4b8948e1b9397e381
                             &key=note
                             &value=background%20objects

## Response

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

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