FUNCTION section_summary($s)
{
    <Section>
         $s/Title,
         (
             LET $f := $s/Figure
             RETURN <Figcount> count($f) </Figcount>
         ),
         (
             FOR $ss IN $s/Section
             RETURN section_summary($ss)
         )
    </Section>
}

<toc>
(
    LET $stf := document("cookbook.xml")
                FILTER //Section | //Title | //Figure
    FOR $s IN $stf/Section
    RETURN section_summary($s)
)
</toc>