@staticmethod<EOL><INDENT>def from_xyz(x, y, z, alpha=<NUM_LIT:1.0>, wref=_DEFAULT_WREF):<DEDENT>
return Color(xyz_to_rgb(x, y, z), '<STR_LIT>', alpha, wref)<EOL>
Create a new instance based on the specifed CIE-XYZ values.

        Parameters:
          :x:
            The Red component value [0...1]
          :y:
            The Green component value [0...1]
          :z:
            The Blue component value [0...1]
          :alpha:
            The color transparency [0...1], default is opaque
          :wref:
            The whitepoint reference, default is 2° D65.

        Returns:
          A grapefruit.Color instance.

        >>> Color.from_xyz(0.488941, 0.365682, 0.0448137)
        Color(1.0, 0.5, 0.0, 1.0)
        >>> Color.from_xyz(0.488941, 0.365682, 0.0448137, 0.5)
        Color(1.0, 0.5, 0.0, 0.5)