XML Syntax Rules
  XML  Syntax Rules  The syntax rules of XML  are very simple and logical. The rules are easy to learn, and easy to use.  1.      All XML Elements Must Have a Closing  Tag  In  XML, it is illegal to omit the closing tag. All elements must  have a  closing tag:      <p>This is a paragraph</p>   <p>This is another paragraph</p>        2.      XML Tags are Case Sensitive  XML tags are case sensitive. The tag <Letter> is  different from the tag <letter>.  3.      XML Elements Must be Properly Nested  In  XML, all elements must  be properly nested within each other:      <b><i>This text is bold  and italic</i></b>        4.      XML Documents Must Have a Root  Element  XML  documents must contain one element that is the parent  of all other  elements. This element is called the root  element.      <root>     <child>    ...