PDF/X conformance constants.
PRN_PDFX_CONFORM_NONE
Turn off PDF/X output
PRN_PDFX_CONFORM_1A
PDF/X-1a:2001 compliant (ISO 15930-1:2001)
PRN_PDFX_CONFORM_3
PDF/X-3:2002 compliant (ISO 15930-3:2002)