---- transformation
<?xml version="1.0"?>
<connectionStrings xdt:Transform="Replace" xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
	<a>aaa</a>
	<b>bbb</b>
	<c>ccc</c>
</connectionStrings>


---- source
<?xml version="1.0" encoding="ISO-8859-1"?>
<connectionStrings>
	<x></x>
	<x></x>
	<x></x>
	<x></x>
	<x></x>
</connectionStrings>

---- result
<?xml version="1.0" encoding="ISO-8859-1"?>
<connectionStrings><a>aaa</a><b>bbb</b><c>ccc</c></connectionStrings>

---- command line
ctt pw verbose s:src.txt t:transform.txt d:dst.txt