xsl document not using cache in IE

[EDN Admin]

I am revisiting a caching item that has been out there several years (link below points to original description).
Just curious if there has been any update on this or if the best work-around is to just use an extension function to fetch the xml document.
In my scenario we have customers that are forced to use IE as part of corporate policy so using another browser is not an option.
Also, I am unable to use the include in the xsl as the name of the xml document being imported is being determined within the xsl (messages_en-US.xml, messages_en-GB.xml, etc). Sample below.
Thanks
http://groups.google.com/group/microsoft.public.xsl/browse_frm/thread/8b5b53da26d141df/a072d17652a1f9ac?lnk=st&q=&rnum=4#a072d17652a1f9ac" title="http://groups.google.com/group/microsoft.public.xsl/browse_frm/thread/8b5b53da26d141df/a072d17652a1f9ac?lnk=st&q=&rnum=4#a072d17652a1f9ac" style="border:none; font-family:Segoe UI,Lucida Grande,Verdana,Arial,Helvetica,sans-serif; margin:0px; outline:0px; padding:0px; color:#0066dd; text-decoration:none; list-style-type:none; font-size:13px; line-height:16px http://groups.google.com/group/microsoft.public.xsl/browse_frm/thread/8b5b53da26d141df/a072d17652a1f9ac?lnk=st&q=&rnum=4#a072d17652a1f9ac


<xsl:variable name="messageFileName <br/>
<xsl:text>../xml/messages_</xsl:text><br/>
<xsl:value-of select="$thisLocale"/><br/>
<xsl:text>.xml</xsl:text><br/>
</xsl:variable><br/>
<br/>
<xsl:variable name="messageFile" select="document(string($messageFileName))"/><br/>

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