This Recommendation extends SDL to provide mechanisms to specify data encoding, so that data passed between different parts of an SDL system (or between SDL systems) has an implementation-independent encoding.
ITU-T Z.104-2004 history
2016ITU-T Z.104-2016 Specification and Description Language �C Data and action language in SDL-2010 (Study Group 17)
2011ITU-T Z.104-2011 Specification and Description Language – Data and action language in SDL-2010 (Study Group 17)