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ANSI CGATS/ISO 15930-4:2004 (R2021)
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)
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.
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Association for the Suppliers of Printing, Publishing & Converting Technologies [npes]