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==Pre-Evaluation==
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==Logic==
If expressions can often be simplified:
<syntaxhighlight lang="xquery">
for $a in ('a', '')
return $a[boolean(if(.) then true() else false())]
(: rewritten to :)
for $a in ('a', '')
return $a[boolean(.)]
(: rewritten to :)
for $a in ('a', '')
return $a[.]
(: rewritten to :)
("a", "")[.]
</syntaxhighlight>
Boolean algebra (and set theory) comes with a set of laws that can all be applied to XQuery expressions.
return $input1[not(. = $input2)]
</syntaxhighlight>
=Changelog=
Introduced with Version 9.4.
