[pdftex] Support of PDF subsets (PDF/X, PDF/A)

[Reviczky Ádám János]

Does pdftex support any kind of PDF subsets, like PDF/X or PDF/A?
Couldn't find any information about that. If not, are there plans for
this? Warnings can be added f.a. if specified functions are not in any
subset (an example is if the fonts are not fully embedded, etc.).

There is a free tool (PDF/X-3 Inspector) for Windows and Mac for
checking the PDF/X standard: http://www.pdfx3.org/

Adam