Rule 1:
Root:
Root Element is the parent of all other nodes.
Example:
| <root> <First child> <First sub child>.…</First sub child> <Second sub child>.…</Second sub child> </First child> </root> |
Rule 2:
XML Pro log:
XML prolog is optional. If XML exists then XML must come first in the document.
Example:
| <?xml version=”1.0″ encoding=”UTF-8“?> |
Rule 3:
Case Sensitivity:
XML tags are case sensitive.
Example:
| <author> sameed </author>
<AUTHOR> sameed <AUTHOR> |
In this example both tags representing different tags.
Rule 4:
Attributes values must be qouted.
Example:
| Wrong Practice | Right Practice |
| <book date=12/11/2007> <title>Book On XML</title> </book> |
<book date=“12/11/2007“> <title>Book On XML</title> </book> |
Rule 5:
Comment:
Comment are used to give some opinion for better understanding.
Example:
| < ! −− this is comment − − > |
Rule 6:
Starting and closing of tags:
- Every tag should have starting and ending.
- For example <author> is the starting of author tag and </author> is the closing of the author tag.
- Early starting tag should be late closed and late started tag should be early close. Example is shown in the diagram below.
