[xsl] Applying external XML

[Rob Belics <rob_belics@xxxxxxxxxxx>]

I'm trying to import xml data from other files on a remote server and
apply templates to that data. Everything in my "restaurant.xsl" works
and I've retrieved "menu.xml" which contains links (item-uri) to other
xml files (item.xml) that contain more info about each item for sale on
the menu (tuna and roast beef). However, I'm having problems trying to
import the item.xml data. 

I tried <xsl:apply-templates select="document()" /> in between the
'for-each' with various combinations of xpath for the document() but
that hasn't gotten results I need. 

restaurant.xsl:
<xsl:template match="menu">
        <menu>
		<xsl:for-each select="item-uri">
<!-- What goes here? Should I be using 'for-each'? -->
		</xsl:for-each>
        </menu>
</xsl:template>

menu.xml:
<menu>
        <item-uri>tuna.xml</item-uri>
        <item-uri>roast-beef.xml</item-uri>
</menu>

item.xml:
<order>
                <size>
                        <name>Tuna</name>
                        <price>5.00</price>
                </size>
</order>