#38231

> Is it possible to convert PDF to PDF UA (accessible PDF) using PD4ML

No. I am afraid this type of conversion is not possible robust automated way.

PDF/UA requires a lot of additional information, normally missing in regular PDFs: alternative text description for all content portions, for visual elements and artifacts; requires structure information (tagging) for tables, lists, headings etc.
By HTML-to-PDF conversion the info can be provided via HTML tag attributes, the structure info comes from the HTML document structure.