Internet Explorer does not like DITA 1.0

[Christopher Wong <cwong@idiominc.com>]

Internet Explorer does not like DITA 1.0's DTDs. When I tried to open a DITA 1.0 file in IE 6, I get the following message:

The XML page cannot be displayed

Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later.

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Use of default namespace declaration attribute in DTD not supported. Error processing resource 'file:///C:/WorldServer/75x/...

<concept id="specdesign" xml:lang="en-us">

Firefox and Opera has no trouble with DITA 1.0's DTDs.

Chris