Part2.xsd will not display in IE5

Microsoft IE5 complains about xmlns:x not being fixed in the following line in Part2.xsd:

<!ATTLIST element xmlns:x CDATA #IMPLIED><!-- keep this schema XML1.0 valid -->

My interpretation is that the parser's behavior is a well-intentioned but wrong.  However since the line is in the DTD for compatibility to begin with, changing the line to:

<!ATTLIST element xmlns:x CDATA #FIXED "http://www.w3.org/XML/1998/namespace"><!-- keep this schema XML1.0 valid -->

should preserve compatibility with the most ubiquitous XML parser.