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 declare variable $where as xs:string := string($fileTree/@filePath);
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 <html>
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   <head>
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     <title>All cpp files in: {$where}</title>
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   </head>
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   <body>
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     <p>
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       cpp-files found in {$where} sorted by size:
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     </p>
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     <ul> {
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       for $file in $fileTree//file
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       order by xs:integer($file/@size)
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       return
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         <li>
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           {string($file/@fileName)}, size: {string($file/@size)}
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         </li>
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     } </ul>
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   </body>
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 </html>