Configuration config = new Configuration();
            staticQueryContext = new StaticQueryContext(config);
            dynamicQueryContext = new DynamicQueryContext(config);
            

<?xml version="1.0" encoding="UTF-8"? >
            <!DOCTYPE library SYSTEM "dtd/book.dtd">
            <booklist>
            <book category="COOKING">
            <title lang="en">Everyday Italian</title>
            <authors>
            <author>Giada De Laurentiis</author>
            </authors>
            <isbn></isbn>
            <numberCopies>1</numberCopies>
            <status>On Shelf</status>
            <year>2005</year>
            <library>John C. Hart Library</library>
            <price>30.00</price>
            </book>
            ...
            </booklist>
            

<collection >
            <doc href="newbooks_library_01.xml"/>
            <doc href="newbooks_library_02.xml"/>
            <doc href="newbooks_library_03.xml"/>
            <doc href="newbooks_library_04.xml"/>
            <doc href="http://localhost:9080/bookinfor/newbooks_localhost.xml"/>
            </collection>
            

(: -------------------------- :)
            (: declares ......:)
            (: -------------------------- :)
            declare namespace local = "http://localhost/ns";
            declare variable $title as xs:string external;
            declare variable $author as xs:string external;
            declare variable $year as xs:string external;
            declare variable $emptymsg as xs:string external;
            declare variable $oversizedmsg as xs:string external;
            declare variable $outputformat as xs:string external;
            (: -------------------------- :)
            (: functions                  :)
            (: -------------------------- :)
            declare function local:error_view($helpmsg as xs:string) {
            if($helpmsg) then $helpmsg
            else ('<report status="0">Please call 1-800-123-4567</report>')
            };
            declare function local:html_view($doc) {
            <table>
            <tr> <td>Library Name</td>
            <td>Book Title</td>
            <td>Number of Copies</td>
            <td>Status</td>
            </tr>
            {   for $book in $doc/book
            where $book/title/@lang="en"
            order by $book/library
            return <tr>
            <td>{$book/library}</td>
            <td>{$book/title/text()}</td>
            <td>{$book/numberCopies}</td>
            <td>{$book/status}</td>
            </tr>
            }
            </table>
            };
            (: -------------------------- :)
            (: the business logic         :)
            (: -------------------------- :)
            let $docs := ('bookinfor/book_collection.xml')
            let $searchdoc := (
            <report status='1'>
            {
            if($title and $year and $author) then (
            for $doc in collection($docs)//booklist/book[contains(title,$title)
            and (year = $year)]
            where contains($doc//authors, $author)
            return $doc
            ) else if($title and $year ) then (
            for $doc in collection($docs)//booklist/book[contains(title,$title)
            and (year = $year)]
            order by $doc//booklist/book/title
            return ($doc)
            ) else if($title and $author ) then (
            for $doc in collection($docs)//booklist/book[contains(title,$title)]
            where contains($doc//authors, $author)
            order by $doc//booklist/book/title
            return ($doc)
            ) else if($author and $year ) then (
            for $doc in collection($docs)//booklist/book[(year=$year)]
            where contains($doc//authors, $author)
            order by $doc//booklist/book/title
            return ($doc)
            ) else if($title) then (
            for $doc in collection($docs)//booklist/book[contains(title,$title)]
            order by $doc//booklist/book/title
            return ($doc)
            ) else if($author) then (
            for $doc in collection($docs)//booklist/book
            where contains($doc//authors, $author)
            order by $doc//booklist/book/title
            return ($doc)
            ) else if($year) then (
            for $doc in collection($docs)//booklist/book[(year=$year)]
            order by $doc//booklist/book/title
            return ($doc)
            ) else (
            for $doc in collection($docs)
            return ($doc//booklist/book)
            )
            }
            </report>
            )
            (: -------------------------- :)
            (: return results             :)
            (: -------------------------- :)
            return  if(count($searchdoc//book) eq 0) then local:error_view($emptymsg )
            else if(count($searchdoc//book) gt 100)
            then local:error_view($oversizedmsg)
            else if($outputformat eq $html)
            then local:html_view($searchdoc)
            else $searchdoc
            

dynamicQueryContext.setParameter("emptymsg", "No results exist!");
            dynamicQueryContext.setParameter("oversizedmsg",
            "Too many results, please refine queries");
            staticQueryContext.setBaseURI("c:/tmp/xmldatasources/");
            fileReader = new FileReader(request.getRealPath("/")+  "/queries/booklist_app.xql");
            queryExpression = staticQueryContext.compileQuery(fileReader);
            writer = new StringWriter();
            StreamResult result = new StreamResult(writer);
            Properties props = new Properties();
            queryExpression.run(dynamicQueryContext, result, props);
            retContent = writer.getBuffer();