under "General Attributes". The keyword is explained and in the description is told that "cupsFlipDuplex" is deprecated by this keyword. In the source code of CUPS 1.3 (cups/ppd.c) only the deprecated "cupsFlipDuplex" and not the new "cupsBackSide".
Also in the CUPS Raster output device (cups/gdevcups.c) the new "cupsBackSide" is not supported.
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