This code sample is adapted from Clifford B. Anderson and Joseph C. Wicentowski, XQuery for Humanists (College Station: Texas A&M University Press, 2020), 132. Download this code sample in its raw form. View the source on GitHub.

xquery version "3.1";

declare variable $book-count := 100;

fn:concat("You have ", $book-count, " books in the database.")