Graphic technology - Prepress digital data exchange using PDF - Part 4: Complete exchange of CMYK and spot colour printing data using PDF 1.4 (PDF/X-1a) (ISO 15930-4:2003, IDT)
This part of ISO 15930 specifies the use of the Portable Document Format (PDF) Version 1.4 for the
dissemination of complete digital data, in a single exchange, that contains all elements ready for final print
reproduction. CMYK and spot-colour data are supported in any combination.