* The following expressions use strings as keys. All of them return 'XML':<br/>
<pre class='brush:xquery'>
xquery:eval(".", map { '': 'XML' }), xquery:eval("declare variable $xml external; $xml", map{ 'xml' := 'XML' }), xquery:eval( "declare namespace pref='URI'; declare variable $pref:xml external; $pref:xml", map { '{URI}xml': 'XML' }),
</pre>
* The following expressions use QNames as keys. All of them return 'XML':<br/>