Choroba, thanks. Your syntax gave me a clue that leads to a solution (XSH2 is not in the ppm library for Activestate and since it took almost all day to load LibXML I am reluctant to go down that path). Here is my solution, albeit a little more verbose...the syntax is at least obvious which is a benefit for simpletons like myself!

my ($value) = $root->findnodes('/Settings[1]/Channels[1]/Channel[@Name
+="Ln"]/@Voltage ');
$value->setValue($new_voltage);}
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So now my question is, does the above get me into any trouble??? Thanks Again Chris