# ListImageComparisonReferences

Returns a list of references in a specified database. The action can also return information about the image and metadata associated with each reference.

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`database` | The name of the database that contains the references to list. | Yes
`identifier` | A comma-separated list of identifiers to specify the references to list. If you do not set this parameter, Media Server lists all of the references in the specified database. | No
`imagestatus` | A Boolean value (default false) that specifies whether to return the label and training status of each image associated with each reference. | No
`maxresults` | The maximum number of references to return. | No
`metadata` | A Boolean value (default false) that specifies whether to return the metadata associated with each reference. | No
`start` | The starting point for the list when you set the `maxresults` parameter. For example, to start listing references from the tenth reference in the database, set `start=10`. The entries in the database are indexed from 1. | No

## Example

The following example lists up to 10 references contained in the `ReferenceImages` database:

    /action=ListImageComparisonReferences&database=ReferenceImages
                                         &imagestatus=TRUE
                                         &metadata=TRUE
                                         &start=1
                                         &maxresults=10

## Response

The response always includes the following information for each reference:

- `identifier` - The identifier of the reference.
- `numimages` - The number of training images associated with the reference.
- `numtrained` - The number of images associated with the reference that have been trained (the number that are used for image comparison).
- `numfailed` - The number of images associated with the reference where training failed.

If you set the action parameter `imagestatus` to `true`, Media Server returns the status of each training image associated with each reference.

- The `status` element indicates the status of training:

  - `trained` indicates that training was successful.
  - `failed` indicates that Media Server could not use the image for training.

    <autnresponse>
      <action>LISTIMAGECOMPARISONREFERENCES</action>
      <response>SUCCESS</response>
      <responsedata>
        <entry>
          <identifier>6d8e53fd92e601a4b8948e1b9397e381</identifier>
          <numimages>1</numimages>
          <numtrained>1</numtrained>
          <numfailed>0</numfailed>
          <numuntrained>0</numuntrained>
          <images>
            <image>
              <label>image1</label>
              <status>trained</status>
              <hasimagedata>true</hasimagedata>
            </image>
          </images>
          <metadata>
            <item>
              <key>PartNumber</key>
              <value>8572087</value>
            </item>
          </metadata>
        </entry>
      </responsedata>
    </autnresponse>

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