SQLTransformer problem

[Mike Holt]

Hi,
I'm perplexed by an error that I keep receiving when trying to process an
XSL page contain a dynamic SQL query:
Description: org.apache.cocoon.ProcessingException: Exception in
ServerPagesGenerator.generate(): java.lang.IllegalArgumentException:
Unknown type of result: class javax.xml.transform.dom.DOMResult 
My sub-sitemap contains the following:
<map:match pattern="*.xsp">
  <map:generate type="serverpages"
src="" />
  <map:transform type="xslt"
src="" />
  <map:transform type="sql">
    <map:parameter name="use-connection"
value="vouchers" />
    <map:parameter name="clob-encoding"
value="UTF-8" /> 
  </map:transform>
  <map:serialize type="xhtml" />
</map:match>
...and the stylesheet contains the following:
<xsl:template match="updatesql">
  <execute-query
xmlns="http://apache.org/cocoon/SQL/2.0">
    <query>select * from
reference</query>
  </execute-query>
</xsl:template
The sql namespace is properly declared in both the XSP and the
stylesheet, and I know that the connection pool is correctly defined and
that the connection is working as I am using esql elsewhere in the source
XSP without any problems. I'm using Saxon8 as my processor.
Any help with this would *greatly* appreciated.
Thanks,
Mike