XSLT with nested Elements

Hi,

I would like to number child Elements in the below XML using XSLT. How can we achieve this. basically there can be any number of child Elements nested.

Output :

1 child
1.1 child
1.1.1 child

1 child
1.1.

1 child
1.1 child










Input xml

<?xml version="1.0" encoding="utf-8"?>
<root>
  <child>
    <child>
      <child>
       
      </child>
     
    </child>    
 
  </child>

  <child>
    <child>

    </child>
  </child>

  <child>
    <child>
     
     
    </child>
   
  </child>
 
 
</root>