Can't open xml document in IE 6.0

Hi,

I have declared the following to support MathML in my xml document.

<?xml version="1.0"?>
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook V4.5CR2//EN" 
"Y:\Software\docbook\docbookx.dtd" [
<!ENTITY % MATHML.prefixed "INCLUDE">
<!ENTITY % MATHML.prefix "mml">
<!ENTITY % equation.content "(alt?, (graphic+|mediaobject+|mml:math))">
<!ENTITY % inlineequation.content "(alt?, 
(graphic+|inlinemediaobject+|mml:math))">
<!ENTITY % mathml PUBLIC "-//W3C//DTD MathML 2.0//EN" 
"Y:\Software\docbook\mathml2.dtd">
%mathml;
] >

But I can't open my xml document in Internet Explorer 6.0, it shows the 
following error:

"Reference to undeclared namespace prefix: 'mml'. Error processing resource 
'file:///C:/sundar/test/sample.xml'. Line 15, P...

<equation id="ch001eq01" 
label="1.1"><mml:math><mml:semantics><mml:mrow><mml:msub><mml:mi m..."

Could any one help me out o solve the above one. Herewith I have attached my 
sample xml file

-Sunder Raajan

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