X tree-queries-results-q1:

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> }; <toc> { for $s in /book return local:toc($s) } </toc>

 X tree-queries-results-q2:

<figlist> { for $f in //figure return <figure> { $f/@* } { $f/title } </figure> } </figlist>

 X tree-queries-results-q3:

<section_count>{ count(//section) }</section_count>, <figure_count>{ count(//figure) }</figure_count>

 X tree-queries-results-q4:

<top_section_count> { count(/book/section) } </top_section_count>

 X tree-queries-results-q5:

<section_list> { for $s in //section let $f := $s/figure return <section title="{ $s/title/text() }" figcount="{ count($f) }"/> } </section_list>

 X tree-queries-results-q6:

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> { local:section-summary($section/section) } </section> }; <toc> { for $s in /book/section return local:section-summary($s) } </toc>