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File: Data.xml
<?xml version="1.0"?>
<bib>
<book year="1988">
<title>title 1</title>
</book>
<book year="2004">
<title>title 2</title>
</book>
</bib>
File: Query.xquery
<books>{
for $book in doc("Data.xml")/bib/book
let $t := $book/title/text() order by $t return
<book><title>{$t}</title></book>
}</books>
Output:
<?xml version="1.0" encoding="UTF-8"?>
<books>
<book>
<title>title 1</title>
</book>
<book>
<title>title 2</title>
</book>
</books>
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