Applies to- QuarkXPress 2018

As Jaws, the PDF engine incorporated into QuarkXPress 2017 and before, could not give us the functionality needed for tagged PDF, QuarkXPress 2018 now uses the best PDF technology on the market - the Callas PDF Print Engine, which also contains Adobe's PDF libraries.

The PDF Toolbox technology by Callas is not only the best PDF technology available, Quark also have a long history with Callas for PDF/X preflight checks. 

It enables a user to Export PDF as PDF/X and PDF/A.