Unitless width and height in mglyph

Hi,

If I read chapter 2 correctly, unitless width/height on mglyph should be 
interpreted as multiple of the original image size:

"The default value, or how it is obtained, is listed in the table of 
attributes for each element. (See also Section 2.1.5.4 Default values of 
attributes.) A number without a unit is intepreted as a multiple of the 
default value."

However, in these pages from the MathML test suite, the size attributes 
are used as if they were "px". I guess units are missing.

http://www.w3.org/Math/testsuite/build/mathml3/Presentation/TokenElements/mglyph/mglyph_aspect-full.xhtml
http://www.w3.org/Math/testsuite/build/mathml3/Presentation/TokenElements/mglyph/mglyph_aspect_gif-full.xhtml
http://www.w3.org/Math/testsuite/build/mathml3/Presentation/TokenElements/mglyph/mglyph_stretched-full.xhtml

-- 
Frédéric Wang.
Website <http://www.maths-informatique-jeux.com/> - Weblog 
<http://www.maths-informatique-jeux.com/blog/frederic/>