How do I make atlas pages pass W3C Validator?

Whenever I try to validate asp.net pages with atlas controls on the W3C Validation Service I get errors like this:

ErrorLine 506 column 19:there is no attribute "xmlns:script".
<page xmlns:script="http://schemas.microsoft.com/xml-script/2005" xmlns:atlascon

and

ErrorLine 506 column 93:there is no attribute "xmlns:atlascontrolextender".
...ipt/2005" xmlns:atlascontrolextender="atlascontrolextender" xmlns:atlascontro

I was really surprised this didn't work especially when it says at the top that it has imported these namespaces:

http://schemas.microsoft.com/xml-script/2005atlascontrolextenderatlascontroltoolkit

Is there something that I'm supposed to do to make this work that I'm missing?

I'm not an expert, but Ithink that if you were to convert all XML script tags inside the (XHTML) <script> tag to be prefixed with script:, it would work. E.g.:

<script:page xmlns:script="http://schemas.microsoft.com/xml-script/2005"...>
<script:otherTag>
</script:otherTag>
</script:page>

How do do this, though, is anyone's guess :(.