display="block" question

Here's a very small point I would appreciate comments on.
(Possibly something for the MathML3.0 team.)

If I am writing an XHTML+MathML document and want to
"display" an equation ($$ ... $$ or \[ ... \] in LaTeX)
I should do

  <math display="block"> ... </math>

Depending on the style of the document, I may require
punctuation after the equation.  This is usually , . or ;
Some document-styles will require none.  Because LaTeX
teaches us to do this, I have been putting the punctuation
inside the <math>...</math>, and it looks fine, but of
course this punctuation is not part of the equation at
all so ought not be there. My question is, where should
it go?

Best wishes

Richard