Summary: Do cie-lab-color() and cie-lchab-color() need optional
Version: 2.0 Working Draft
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XSL FO 2.0's cie-lab-color() and cie-lchab-color()  are meant to be
compatible with what can be expressed in SVG Color 1.2 .
The cielab() and cielchab() functions in SVG Color 1.2 both have an option
white point parameter.
Should XSL FO 2.0 have this parameter in its functions?