MVS/ESA 4.3 open edition support POSSIX standard (1003.1/1a/1c and 1003.2). Additional function was added to MVS 5.2.2 to meet the XPG4 and over 90% of XPG4.2. More function added later and OpenEdition became an official UNIX system (from application perspective, there is no difference).
XPG4 branded means zOS supports a common set of UNIX API. Branded means zOS is registered to /Open and IBM is entitled to use the X/Open trademark. XPG4.2invlift all commands and utilities and C services
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