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Changed 'oder' to 'or'
'''Result:''' <code>42</code>
</li>
<li>Getting the function item of an existing (built-in oder or user-defined) XQuery function. The arity (number of arguments) has to be specified as there can be more than one function with the same name:
<pre class="brush:xquery">let $f := math:pow#2
return $f(5, 2)</pre>
