MathML2.0 inclusion not parsing

Hello

I am trying to include MathML2.0 in my custom DTD as follows:

<!ENTITY % NS.prefixed     "INCLUDE">
<!ENTITY % MATHML.prefix   "math">
<!ENTITY % NamespaceDecl.attrib "xmlns:math CDATA #FIXED 
'http://www.w3.org/1998/Math/MathML'">

<!ENTITY % mathml PUBLIC "-//W3C//DTD MathML 2.0//EN"
                  "./mathml/mathml2.dtd">
%mathml;

<!ELEMENT doc (intro, equation+)>
<!ATTLIST doc
	xmlns:math CDATA #FIXED "http://www.w3.org/1998/Math/MathML">

<!ELEMENT equation (math:math)>
<!ELEMENT intro (#PCDATA)>

Can any one explain why my document is not parsing.

Thank you for your help

Vidjin

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