> Or are the hooks there to make much more accessible PDFs, and the issue is that various popular generators of those documents (especially WYSIWYG ones like

> Or are the hooks there to make much more accessible PDFs, and the issue is that various popular generators of those documents (especially WYSIWYG ones like MS Word) either don't populate them, or perhaps don't even have the needed semantic data in the first place? Tagged PDF is a thing, and MS Word supports it. THe problem is the very long tail of programs that generate PDFs and don't support tagged PDF. Even some widely used PDF generators, like pdflatex, don't generate tagged PDF, at least not by default.