The Color Exchange Format version 3 (CxF3) developed by X-Rite was adopted as ISO Standard 17972-1:2015. The purpose of this format is the exchange of information about color for a broad range of applications in electronic form in XML format. X-Rite has published additional information on .
The CxF3 format (ISO 17972-4) will be used in PDF 2.0 to define additional information for spot colors (e.g. spectral data, opacity, …). This is especially interesting for PDF prepress data for packaging since there unconventional spot colors (e.g. silver, gold, metallic) can be used which have a different printing behaviour than “regular” spot colors.