How to do nested queries

Hi,

I need to use one attribute from a tag in the result
of a query to make a query to another document. How
can I do it?

The XSP code I use is:
<xsp:page xmlns:xsp="http://apache.org/xsp"
xmlns:xmldb="http://exist-db.org/xmldb/1.0">
	<unit>
			<xmldb:collection uri="xmldb:exist:///db">
				<xmldb:execute>
					<xmldb:xpath>
                       
"document('/db/babelis/ExpText.xml')//ExpText[metainfo/@id"
+
                        "&amp;='" +
request.getParameter("id") + "']"
                    </xmldb:xpath>
					<xmldb:results>
							<xmldb:get-xml as="xml"/>
					</xmldb:results>
				</xmldb:execute>
			</xmldb:collection>
	</unit>
</xsp:page>


In the first query the result I get is like:

<ExpText ino:id="302" exist:id="310"
exist:source="/db/babelis/ExpText.xml"
xmlns:exist="http://exist.sourceforge.net/NS/exist"
xmlns:ino="http://namespaces.softwareag.com/tamino/response2">
  |
  |
  |  
 <NextSectionPageType linkedcontenttype="ExerciseType"
ref="13"/> 
</ExpText>

I need to use the attribute @ref to make another
query. Can I use this value in another query in the
same XSP page?

Thanks Victor

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