A single XPath expression can find a maximum. Here is an example using XML::XSH2, a wrapper around XML::LibXML: 
open 1.xml ;
echo //doc/str[@name="docuid" and not(text() < //doc/str[@name="docuid
+"]/text())] ;

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In reply to Re: Finding max value from a unique tag from XML by choroba
in thread Finding max value from a unique tag from XML by Shaveta_Chawla

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