Validator accuses <svg:g enable-background="new"> as error

Hi all,

Thanks for the great validator. I use it all the time.  I've recently  
noticed, it is calling the usage of enable-background="new" on a svg G  
an error.  Looking at the DTD for XHTML+SVG+MathML, I see that enable- 
background is part of the container attributes, which is part of  
presentational attributes, which is on the attribute list of both svg  
and g elements (among others).  When using enable-background on the  
svg element, there is no error reported.

Ramsey