Recently released QuarkXPress 2018 makes use of the Callas pdfToolbox internally. In the new XPress version pdfToolbox (with the help of the integrated Adobe PDF Library) now takes care of the conversion of the PostScript output from XPress into a PDF file. This was previously done with the built-in PDF Creator from Global Graphics.
Users of QuarkXPress 2018 can also use the pdfToolbox technology to create a single PDF file which complies with both PDF/X-4 and PDF/A-2. PDF/A is the ISO standard for long-term archiving, while PDF/X-4 is the ISO standard for exchanging printable PDF files. Users of QuarkXPress 2018 can also ‘tag’ the PDF files they create, providing internal information on the structure of the file’s content and the correct reading order. This latter feature is a prerequisite for accessible PDF files, meaning that users now only need to create and retain a single PDF file to fulfill printing, accessibility and long-term archiving requirements. This considerably simplifies PDF-based workflows! This is also shown in a video on YouTube.