> I'm talking about the correct conversion xyY to s(c)RGB and nothing else.

In that case the idea of a "source whitepoint" is meaningless - xyY 
specifies colours exactly in absolute colour space, there is no need for a 
reference white, nor does one exist.  An xyY colour like (0.3,0.3,10) 
specifies one unique colour exactly, no need for any additional information 
about a white point.

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