So where did the above "PDF and PS are programming languages" argument come from? References, please!
No references, sorry, but I certainly got the impression from the books I had years ago (PostScript reference manuals) that PostScript was meant as a programming language.
iirc it's an rpn notation that is actually very similar to Forth, which definitely is a programming language.
It's merely a strange, domain-specific language the purpose of which is to describe and lay out a page of paper, but presumably no different from (if I've got the right language) VHDL which is used to lay out a printed circuit board. And both of them are in some cases written in directly by their practitioners, and in other cases are generated by program generators.
Cheers, Wol -- Anthony W. Youngman - anthony@thewolery.demon.co.uk