what is correct way to express a type as CDATA in XML schema

MSXML4 fails on following (error: " undeclared XSD type: 'CDATA' "):

<xsd:complexType name="AClass">
	<xsd:all>
		<xsd:element name="Value" type="CDATA" minOccurs="0"
maxOccurs="1" />
	</xsd:all>
</xsd:complexType>

I checked through the schema[0-2] docs at http:\\www.w3c.org (as best I
could ;) ) but did not see any obvious example / discussion of how to
use CDATA as a 'type' in a schema. From examples I perceived that CDATA
might be an 'intrinsic' type, hence the above syntax, but it does not
work.

Any ideas?

</pff>