DTD to Schema question

Looking to use a schema instead of a dtd and am having problem with the link
to the schema in my xslt file.
 
Anybody know how to link to a schema, I'm doing something like
 

<TEST xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://www.caiso.com/test.xsd">

<xsl:value-of select="@TEST"/>

....other structure here.

</TEST>

 

But I get errors.  <TEST> is my root element.


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