<?xml version="1.0"?> 
<xupdate:modifications version="1.0" xmlns:xupdate="http://www.xmldb.org/xupdate">
<xupdate:append select="/"  child="first()" >  <xupdate:element name="gap">  </xupdate:element>
</xupdate:append>

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

</xupdate:modifications>