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| '''Summary'''
|Returns nodes in ''distinct document order'': duplicate nodes will be removed, and the remaining nodes will be returned in [https://www.w3.org/TR/xquery-31/#dt-document-order document order]. As results of path expressions are brought into distinct document order before they are returned, the function is equivalent to:
<pre lang='xquery'>
$nodes/self::node()
|Returns the document nodes of the specified {{Code|$nodes}}. The path expression <code>/abc</code> is internally represented as <code>util:root(.)/abc</code>. Equivalent to:
<pre lang='xquery'>
util:ddo($nodes x ! /)
</pre>
|}
