How to perform conditional operations in XQuery ?

Example:



for $a in doc("bookmart.xml")/bookstore/book

return if ($a/@category="ADVENTURE")

then <child>{data($a/title)}</child>

else <adult>{data($a/title)}</adult>



Output:



<adult>Jungle Book</adult>

<child>The Book of the Thousand Nights and a Night </child>

<adult>XML Programing</adult>

<adult>XPath and XPointer</adult>