(: --------------------------------------- Use Case "Tree" : Operations on trees --------------------------------------- :) declare variable $book1 := doc("docs/book1.xml"); declare function local:toc($book-or-section as element()) as element()* { for $section in $book-or-section/section return <section> { $section/@*, $section/title, local:toc($section) } </section> }; declare function local:section-summary($book-or-section as element()) as element()* { for $section in $book-or-section return <section> { $section/@* } { $section/title } <figcount> { count($section/figure) } </figcount> { for $section1 in $section/section return local:section-summary($section1) } </section> };