This code sample is adapted from Clifford B. Anderson and Joseph C. Wicentowski, XQuery for Humanists (College Station: Texas A&M University Press, 2020), 211-212. Download this code sample in its raw form. View the source on GitHub.

xquery version "3.1";

let $person :=
    <person xml:id="alcuin_of_york">
        <persName>Alcuin of York</persName>
        <birth when="0735">c. 735</birth>
        <death when="0804-05-19"/>
    $person transform with 
        { insert node attribute sex { "M" } into . }