Update XML data type with child node in Oracle

<pre lang="xml"><?xml version="1.0" encoding="WINDOWS-1252"?>
<Test>
  <Selection ID="A">
    <Child ID="1">
      <Name/>
      <DOB/>
    </Child>
    <Child ID="2">
      <Name/>
      <DOB/>
    </Child>
  </Selection>
  <Selection ID="B">
    <Child ID="1">
      <Present>Yes</Present>
      <Name/>
      <DOB/>
      <Address>Tests</Address>
    </Child>
    <Child ID="2">
      <Present>Yes</Present>
      <Name/>
      <DOB/>
      <Address>Tests</Address>
    </Child>
  </Selection>
</Test>


I am having above above exising XMLtype data type in Oracle Database. I want to update the xml like below,

<pre lang="xml"><pre lang="xml"><?xml version="1.0" encoding="WINDOWS-1252"?>
<Test>
  <Selection ID="A">
    <Child ID="1">
      <Present>Yes</Present>
      <Name/>
      <DOB/>
      <Address>Tests</Address>
    </Child>
    <Child ID="2">
     <Present>Yes</Present>
      <Name/>
      <DOB/>
      <Address>Tests</Address>
     </Child>
  </Selection>
  <Selection ID="B">
    <Child ID="1">
      <Present>Yes</Present>
      <Name/>
      <DOB/>
      <Address>Tests</Address>
    </Child>
    <Child ID="2">
      <Present>Yes</Present>
      <Name/>
      <DOB/>
      <Address>Tests</Address>
    </Child>
  <Selection>
</Test>