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

...
    <MeasurementUnit>inch1200</MeasurementUnit>
    </Description>
    </alto>

use XML::LibXML;
$xml = 'test.xml';
...
$v = $doc->findvalue('/alto/Description/MeasurementUnit');
print "value\t".$v;
}