I face a small issue while translating the tutorial from JP Bourgeoy (mirror effect), I'm facing a problem with the behavior of the clones. -> fill and stroke of the cloned object is locked and synchronized with the original object (while user can choose if geometric transformations are linked or not)
Per SVG spec, the style you assign to a <use> works as if it were the style on a <g> which includes the copy of the source object. This means that for a clone to have e.g. red color, the original which is cloned must have no color at all (it will be painted black by default then). Only in this case the red color from <use> will be inherited into the local copy of the object and it will be red. If however the source object has a color of its own, <use> cannot repaint it.
At least that's my understanding of the spec.