template match on attribute, copy but change value

Hi,
 I'm attempting to find a single attribute and change it's value.  I 
thought this should be simple, but it just doesn't seem to be working.  
Looking at the Rec it says that xsl:copy is not allowed to copy the 
attribute and change it's value (what it looks like in the archives that I 
found as well).  So my question is, can I use the identity transform, then 
have a template matching a specific attribute and copy the attribute to the 
result, but change it's value?
XML File:
<test>
 <Element myAtt="test">
   <child/>
 </Element>
</test>


XSL File:
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
 <xsl:template match="/">
   <xsl:apply-templates select="*"/>
 </xsl:template>

 <xsl:template match="@myAtt">
   <xsl:copy> <!-- this is ignored and will not let me change the value -->
   <xsl:value-of select="'hi there'"/>
   </xsl:copy>
 </xsl:template>

 <xsl:template match="node()|@*">
   <xsl:copy>
     <xsl:apply-templates select="node()|@*"/>
   </xsl:copy>
 </xsl:template>

</xsl:stylesheet>

Expected Output:
<test>
 <Element myAtt="hi there">
   <child/>
 </Element>
</test>


Thanks for any comments,
 Benjamin

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