<math><mfrac><numerator> which need namespace prefix?

Case-A

<mathml:math xmlns:mathml="http://www.w3.org/1998/Math/MathML">
<mfrac>
<numerator>3</numerator>
<denominator>4</denominator>
</mfrac>
</mathml:math>

Case-B

<mathml:math xmlns:mathml="http://www.w3.org/1998/Math/MathML">
<mathml:mfrac>
<numerator>1</numerator>
<denominator>2</denominator>
</mathml:mfrac>
</mathml:math>

http://emle.sourceforge.net/emle020000/testi1.xml
http://emle.sourceforge.net/emle020000/testi1.xsl

Using: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) 
Gecko/20070309 Firefox/2.0.0.3

Case A has mathml: prefix and xmlns:mathml on <mathml:math> but no
prefix on <mfrac> and <numerator>.  It is displayed as "34" rather than
"3/4". Case B has the mathml: prefix added to <mathml:mfrac> but not on
<numerator>. It is displayed as "1/2" as expected.

It would seem reasonable to me if only <math> needed the name space
prefix or if <math>, <mfrac> and <numerator> all needed it but the
results seem odd to me. Is it working correctly? If it is working as
it should I am looking for an explanation.

-- 
C.W.Holeman II | [email protected] http://JulianLocals.com/cwhii
  To only a fraction of the  human  race does God  give the  privilege of
  earning one's bread doing what one would have  gladly pursued free, for
  passion. I am very thankful. The Mythical Man-Month Epilogue/F.P.Brooks