Well, as you can see they have a different spelling, but since they derive from PDF/A and PDF/X which have structurally the same form, the tags should do as well. Thus I think one of them should be renamed, such that we have





It turns out that this approach is flawed because it clashes with the pdfx package. Actually, we'd need three tags:

  • Questions about the PDF/A standard
  • Questions about the PDF/X standard (does not yet exist)
  • Questions about the pdfx package
  • 7
    Personally I like the version with the hyphen for the PDF standards (which would ignore the package pdfx which contains no hyphen). – TeXnician Apr 18 '18 at 9:50
  • @TeXnician That's actually a good point. I totally forgot that there is the pdfx package which could also be referred to by the tag. Now that is a bit of a clash, but since people use pdfx to create PDF/X, the usage of a possible pdf-x should be self-explanatory. – Henri Menke Apr 18 '18 at 9:56
  • 4
    pdfx is a package, so many instances of the pdfx tag refer to the package, rather than to PDF/X technology. In fact, it seems that most tags pdfx are actually asking about PDF/A technology, which is also part of the pdfx package. – user139954 Apr 18 '18 at 17:30
  • @RobtAll so we should create another tag so that we have pdf-a, pdf-x, and pdfx? – Skillmon Apr 24 '18 at 6:34
  • @Skillmon It turns out that this question would actually incur a tremendous amount of retagging which has to be done by hand. A question could use the pdfx package with the PDF/X standard in which case it should be tagged pdfx and pdf-x. However, a question regarding the PDF/X standard without the pdfx package would only be tagged pdf-x. – Henri Menke Apr 24 '18 at 6:42
  • @Skillmon I really don't know what is best. What you suggested seems good. The underlying problem is that most users of package pdfx actually use PDF/A (pdf-a), based on questions I've seen here. Now, when someone chooses tags, each tag has a little explanation of what it means. That's where you would distinguish between pdfx (package), pdf-x (technology) and pdf-a (technology). – user139954 Apr 24 '18 at 14:39
  • @RobtAll only problem would be the massive retagging as mentioned by Henri, which I didn't consider when first writing the comment. – Skillmon Apr 24 '18 at 14:58

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