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On the Document Attributes tab, click Add Part
to add a document attribute.
The DNS items with attributes, that are neither used as file parts nor as document
name parts, appear in the Document Attributes page.
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Choose the following option from the drop-down list in the newly added attribute:
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Document Naming System items - Select the document naming system item that do not exist in the document name pattern or file pattern.
You can select one or more attributes, and click Delete Part 
to delete the selected file parts.
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Click Close to close the Document Attributes tab.
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Click Save to save the document discovery pattern.
By default, the Document Naming System page appears with the DNS items ParentDirectory and ParentParentDirectory. These DNS items can be used to define the folder and parent folder of the folder
from which the files are picked as document attributes.