20.144 draw:opacity-name - "independently from other fill styles"? "like gradient, image, and hatch." Do other fill style interact? "like"? Are there other fill styles?

I assume that "independently from other fill styles" means something like:

"opacity is applied after other fill styles have been applied to an image or graphic object."

On the issue of what attributes were meant, see 19.15.1 <chart:chart>, <chart:series>, which reports:

"The term fill attributes is used in defining chart:class values to refer to the attributes of the <style:graphic-properties> element within a chart style: draw:fill, draw:fill-color, draw:fill-gradient-name, draw:gradient-step-count, draw:fill-hatch-name, draw:fill-hatch-solid, draw:fill-image-name, style:repeat, draw:fill-image-height, draw:fill-image-width, draw:fill-image-ref-point, draw:fill-image-ref-point-x, draw:fill-image-ref-point-y, draw:tile-repeat-offset, draw:opacity and draw:opacity-name."