PDF 2.0 Application Note 003 identifies precise locations for PDF objects’ XMP metadata to help drive interoperability across all PDF creators and consumers.
PDF/A-4 is essential to losslessly archiving PDF files that use current-generation PDF 2.0 technology… even including scanned documents. From modern Unicode support to interoperability with other specifications PDF/A-4 is the only way to archive PDF files conforming to PDF 2.0.
The LaTeX Project recently became a Liaison Member of the PDF Association to help accelerate the development of tagged and accessible PDF produced from LaTeX.
To support industry uptake of PDF 2.0, the specification’s ISO Project Leaders, working through the PDF Association, have established a public GitHub repository to facilitate the reporting of issues against ISO 32000-2:2020.