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What's the easiest way to extract the file name from a URL?

Probably like this:

tokenize($uri, "/")[last()]

And if you want to replace the extension of the file name with something different, you could use this simple function:

declare function local:generate-file-name($uri as xs:string, $ext as xs:string) {
  let $fileName := tokenize($uri, "/")[last()]
  let $fileName := replace($fileName,'^(.*)\..*','$1')
  let $fileName := concat($fileName, ".", $ext)
  return $fileName
};

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