draw:extrusion-metal (ODF all versions)

Dear all,

On surface meterials ... not so fast.

Looking back to the draw:* elements we find:

17.161 draw:extrusion-metal

----b
The draw:extrusion-metal attribute specifies if the surface of an
extrusion object looks like metal.
----e

"Looks like metal" ? ... come on ...

Please specify this better (using ODF's own mechanisms from its dr3d:*
elements, maybe).

- Alex.