the package pdfx helps you to produce PDF/A and PDF/X files. But I had severe problems to use this package, attached you find my experience with the package. One general information: pdfx.sty-version "2008/12/10 v1.2" is flawed.
Don't use variable "\Subject" with this version.
The erroneous line is:
Code: Select all
\let\xmpSubject\xmpKeywords
Code: Select all
\def\Subject#1{\gdef\xmpKeywords{#1}}
\let\xmpSubject\@empty
Regards,
ellocco