How SAX works?

• XML Document

     <?xml version="1.0"?>
     <Name>
        <Last_Name>Punin</Last_Name>
        <First_Name>John</First_Name>
     </Name>

• Events

     start document
     start element: Name
     start element: Last_Name
     characters: Punin
     end element: Last_Name
     start element: First_Name
     characters: John
     end element: First_Name
     end element: Name
     end document