Will add the content as the sibling of the node in xPath
<root>
<node>value</node>
</root>
<Change type="AppendAfter" xPath="/root/node">
<Content>
<![CDATA[<node2>value2</node2>]]>
</Content>
</Change>
<root>
<node>value</node>
<node2>value2</node2>
</root>