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XML Query Use Cases: http://www.w3.org/TR/xquery-use-cases/
Copyright ©2003 World Wide Web Consortium, (Massachusetts Institute of Technology, European Research Consortium for Informatics and Mathematics, Keio University). All Rights Reserved. This work is distributed under the W3C® Software License [1] in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
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 Filename: xmpQ3.xq  
 Source:    http://www.w3.org/TR/xquery-use-cases/#xmp-queries-results-q3  
 Section:   1.1.9.3 Q3  
 Purpose:   For each book in the bibliography, list the title and authors, grouped inside a "result" element. 
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<results>
{
    for $b in doc("bib.xml")/bib/book
    return
        <result>
            { $b/title }
            { $b/author  }
        </result>
}
</results>