<?xml version="1.0"?> 
<xupdate:modifications version="1.0" xmlns:xupdate="http://www.xmldb.org/xupdate">
<xupdate:insert-after select="/a[1]/text()[1]" >  <xupdate:element name="LogilabXMLDIFFFAKETag">  </xupdate:element>
</xupdate:insert-after>

<xupdate:remove select="/a[1]/b[1]" />

<xupdate:insert-after select="/a[1]/text()[2]" >  <xupdate:element name="b">  </xupdate:element>
</xupdate:insert-after>

<xupdate:remove select="/a[1]/text()[1]" />

<xupdate:remove select="/a[1]/LogilabXMLDIFFFAKETag[1]" />

</xupdate:modifications>