Knowledge Discovery 25.1
Knowledge Discovery Expert

# Identifiers

An Identifier is a base-64 encoded string that identifies the source of a document in Knowledge Discovery. When Connectors and CFS are used to index documents into the Content component, an identifier is added to every document (in the `AUTN_IDENTIFIER` document field).

The identifier can be used to extract the original file from the repository. An application might need to do this when presenting the results of a query.

The exact content of the `AUTN_IDENTIFIER` field depends on the connector that retrieved the document, but contains information such as:

- The name of the fetch task that was used to retrieve the document. When a connector needs to retrieve a file, it can use the same settings by finding the fetch task in its configuration file.

- The document reference. The document reference identifies the location of a file within a repository. For files retrieved by a File System Connector, the document reference is the path to the file. For e-mail messages retrieved by an Exchange Connector, the document reference includes the name of the message store and folder that contain the message.

## Example Identifier

An example identifier appears below:

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    <id section="MyTask1" reference="http://myserver:4567/doc/_vxswdfguhjknbio_earycqzt_">
       <param name="SERVICEURL" value="http://myserver:4567/service"/>
       <param name="DOCID">_vxswdfguhjknbio_earycqzt_</<param>
    </id>

## Subfile Indexes

Documents in Content can represent subfiles. In these documents, the `AUTN_IDENTIFIER` field contains the identifier of the container file.

To retrieve a subfile from a repository, a connector must retrieve the container file and send it to File Content Extraction so that the subfile can be extracted. You must also specify a subfile index, so that File Content Extraction can extract the correct subfile.

When CFS indexes documents into Content, subfile indexes are automatically written to the `SubFileIndexCSV` document field. For example:

    SubFileIndexCSV="1"

The subfile index in this example (`1`) indicates that the document represents the second file in the container (the subfiles are indexed from 0).

Container files can contain other container files (for example an e-mail message file could contain ZIP file attachments, containing further subfiles). In this case, the subfile index might include more than one level:

    SubFileIndexCSV="2,6"

A subfile index of `2,6` indicates that the document represents the seventh file in the third container, in the original container file.

When an action is sent to a connector to retrieve subfiles, the subfile index must be appended to the identifier of the container. For example:

    PGlkIHM9Ik15VGFzazEiIHI9Imh0dHA6Ly9teXNlcnZlcjo0NTY3L2RvYy9fdnhzd2RmZ3VoamtuYmlvX2VhcnljcXp0XyI+PHAgbj0iU0VSVklDRVVSTCIgdj0iaHR0cDovL215c2VydmVyOjQ1Njcvc2VydmljZSIvPjxwIG49IkRPQ0lEIiB2PSJfdnhzd2RmZ3VoamtuYmlvX2VhcnljcXp0XyIvPjwvaWQ+|2.6

NOTE: Where subfile indexes have multiple levels (for example `SubFileIndexCSV="2,6"`), the comma must be replaced by a period.

## Append Subfile Indexes to the Document Identifier

You can configure CFS to automatically append subfile indexes to the document identifiers, before the documents are indexed into the Content component.

To do this, use the following Lua Script.

NOTE: You must run the script after File Content Extraction has extracted subfiles, so run the script using a Post Import task.

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    function handler( document )
       identifier = document:getFieldValue( "AUTN_IDENTIFIER" )
          if identifier then
             indices = document:getFieldValue( "SubFileIndexCSV" )
             if indices then
                indices = string.gsub(indices, ",", ".")
                document:setFieldValue( "AUTN_IDENTIFIER", identifier .. "|" .. indices )
             end
          end
       return true
    end

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Version 25.1 | Last updated January 2025

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Product: Knowledge Discovery 25.1

Topic Title: Identifiers