Auto tagging a document bases on a date appearing in the document.
Or More globally, getting specific information inside a repetitive document.
Example:
I’m receiving regular invoices from company XYZ. I want DT to search for this company and tag it has XYZ and when it recognize as XYZ, tag it again has the date of the invoice that I can tell DT where it appear.
In this way I can classify easily invoices by date, or by due date to pay etc…
That can be the same kind of functions has Rules inside apple mail.