using xpath id() function on xml:id

gistfile1.xqy

(: xml:id attribute needs to be unique within the specific document scope :)

let $xml := document{  <employees>  
    <employee xml:id="n001">
      <name>Johny Rotten</name>
      </employee>
    <employee xml:id="n002">
          <name>Billy Idol</name>
    </employee>
  </employees>}
  
return
  $xml/id("n002")