At the DocEng conference, I met a lot of academics and professionals discussing interesting requirements and solutions related to PDF documents. It was impressive to see what these people are working on, what they (don't) know about PDF and whether it works according to their needs. Here is my experience ...
Everybody whose occupation is related to a business process that relies on a subset standard will know it: somebody working in prepress will know PDF/X as an archivist knows PDF/A. But for PDF professionals, it also makes senses to know something about other subset standards. One reason could be that it is technically not complicated to create PDF files that comply with more than one standard (major portions of their text are exactly the same). Therefore, we wrote this article with a short description of all PDF based ISO standard!