Changes the value of a specified attribute
This has been deprecated in favour of SetAttribute
<root>
<node attrVal="true">value</node>
</root>
<Change>
<XPath>/root/node</XPath>
<ChangeAttribute attributeName="attrVal">false</AddAttribute>
</Change>
Alternative version
<Change>
<XPath>/root/node</XPath>
<AddAttribute attributeName="attrVal" value="false" />
</Change>
<root>
<node attrVal="false">value</node>
</root>