Well- Formed XML Document

A “Well Formed” XML document has correct XML syntax and follows XML rules for naming elements, attributes etc.
 
A “Well Formed” XML document is a document that conforms to the XML syntax rules, i.e.:
 
XML tags are case sensitive
XML documents must have a root element, only one root element is allowed per file.  
XML elements must be closed, means they must have a closing tag.
XML elements must be properly nested  
XML attribute values must always be quoted 
 
<?xml version=”1.0″ encoding=”ISO-8859-1″?>
<email>
<sender>
      <sender_name>XYZ Kumar</sender_name>
      <sender_email_id>[email protected]</sender_email_id>
</sender>
<recipient>
      <recipient_name>ABC</recipient_name>
      <recipient_email_id>[email protected]</recipient_email_id>
</recipient>
      <subject>Hello! how r U</subject>
<message>
      <message_header>Hello dear</message_header>
      <message_body_text>Hello this is Ravish, how are you dear</message_body_text>
      <message_footer>bye!, take care</message_footer>
</message>
</email>