1. XML documents use a self-describing and simple syntax.
   The first line in the document - the XML declaration - defines the XML version and the character encoding used in the document. In this case the document conforms to the 1.0 specification of XML and uses the ISO-8859-1 (Latin-1/West European) character set.
   The next line describes the root element of the document (like it was saying: "this document is a note"):
   
2. All XML elements must have a closing tag.
   With XML, it is illegal to omit the closing tag.In HTML some elements do not have to have a closing tag.In XML all elements must have a closing tag, like this:
   
3. XML tags are case sensitive.
   Opening and closing tags must therefore be written with the same case:
   
4. All XML elements must be properly nested.
   In XML all elements must be properly nested within each other like this:
   
5. All XML documents must have a root tag.
   All XML documents must contain a single tag pair to define a root element.
   All other elements must be within this root element.All elements can have sub elements (child elements). Sub elements must be correctly nested within their parent element:
   
   
6. Attribute values must always be quoted.
7. With XML, White Space is Preserved.
   With XML, the white space in your document is not truncated.This is unlike HTML.
   
   
8. Comments in XML. The syntax for writing comments in XML is similar to that of HTML.
   

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