XML/XQuery/max

Useful-function: max-string

   <source lang="xml">

File: Data.xml <inventory id="inv0001" date="2008-12-19" loc="USA">

 <car model="A" id="0001" quantity="1" color="navy"/>
 <car model="B" id="0002" quantity="1" color="red"/>
 <car model="B" id="0003" quantity="2" color="red"/>
 <car model="C" id="0004" quantity="1" color="white"/>
 <car model="C" id="0004" quantity="1" color="gray"/>
 <car model="A" id="0001" quantity="1" color="black"/>

</inventory>

File: Query.xquery declare namespace functx = "http://www.wbex.ru"; declare function functx:max-string ($stringSeq as xs:string*) as xs:string?{

  max($stringSeq)

}; (: function call :) functx:max-string(doc("Data.xml")//car/@model)

Output: <?xml version="1.0" encoding="UTF-8"?>C

</source>