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# Update

The `Update` action updates the metadata of documents in a repository. Documents are specified by their identifier.

    /action=fetch&fetchaction=Update
    		      [&config=<Base64_Config>]
    		       &identifiersXML=<Identifiers_XML>
    		      [&<Override_Config_Parameters>]

Type: Asynchronous

Parameter Name | Description | Required
--- | --- | ---
`Config` | A base-64 encoded configuration. The configuration parameters that are set override the same parameters in the connector's configuration file. | No
`IdentifiersXML` | The `IdentifiersXML` parameter specifies the identifiers of the documents to update. It also specifies the metadata to update for each document. The data must be provided in XML format as below:
    <IdentifiersXML>
      <identifier value="[AUTN_IDENTIFIER1]">
        <metadata name="[CustomField1]"  value="[CustomFieldValue1_1]"/>
        <metadata name="[CustomField1]"  value="[CustomFieldValue1_2]"/>
        <!-- ... -->
      </identifier>
      <identifier value="[AUTN_IDENTIFIER2]">
        <metadata name="[CustomField1]"  value="[CustomFieldValue2_1]"/>
        <!-- ... -->
      </identifier>
      <!-- ... -->
    </IdentifiersXML>
| Yes
`Override_Config_Parameters` | Any other action parameters that you set override settings in the connector's configuration file. For example:
    /action=fetch&fetchaction=...
                 &[Section]Parameter=Value
where `[Section]` (optional) is the name of a configuration file section, `Parameter` is the name of a configuration parameter, and `Value` is the parameter value. | No

## Response

As this is an asynchronous action, you receive a token in response to the request. A sample response to the action (as retrieved using the `QueueInfo` action) appears below.

    <fetchaction>UPDATE</fetchaction>
    <tasks>
      <success>[IDENTIFIER1]</success>
      <success>[IDENTIFIER2]</success>
      <failed message="Error message">[IDENTIFIER3]</failed>
    </tasks>

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