problem in tranformation

hi all,

i would like to transform the following xml file with
incorporating of mathml stylesheet(mathml,
pmathml,pmathcss), however it doesn't work. anyone can
tell me how to do it without putting them in xhtml? 

-----------------------------------------------------
<?xml version="1.0" standalone="no"?>
<?xml-stylesheet type="text/xsl" href="pmathml.xsl">

<math xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
     <msqrt>
	<mrow>
	    <msup>
		<mi>a</mi>
		<mn>2</mn>
	    </msup>
	    <mo>+</mo>
	    <msup>
		<mi>b</mi>
		<mn>2</mn>
	   </msup>
	</mrow>
     </msqrt>
</mrow>
</math>
-------------------------------------------------------

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Received on Monday, 26 May 2003 19:50:23 UTC