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XML tutorial

SA
one of my objectives for this article making you curios to know about XML , and make you search the web for more info about it , and i hope do that , lets start.


what is XML stand  for ? eXtensible Markup Language.
it is used to transport data over the internet , you can invent your own tags , no restriction .
for example if you want transport data for weather news:
< weathernews >
< new >
< city > Cairo < / city >
< max >36< / max >
< min > 22 < / min >
< / new >
< / weathernews >
XML  consist of main three component :
  1. tagged elements.
  2. attributes.
  3. text.
lets see example:

< bookstore >
< book category="CHILDREN" >
< title lang="en" > Harry Potter< /title >
< author>J K. Rowling< /author >
< year >2005< /year >
< price>29.99 < /price >
< /book >
< book category="WEB" >
< title lang="en" >Learning XML < /title >
< author > Erik T. Ray < /author >
< year > 2003 < /year >
< price > 39.95 < /price >
< / book >
< /bookstore >


in the previous example we can find :

  1. tagged elements like bookstore , book , year,....etc
  2. attributes category ="CHILDREN", lang="en"
  3. Text like HarryPotter ,Erik T. Ray
lets now talk about some rules for XML :

  • tags are case sensitive .
  • tags must be closed .
  • document must have one root element in the first example the root element was < weatherNews > in the second example the root element was < bookstore >.
  • XML attribute must be quoted for example  : lang="en"  .
well formed XML must adheres the previous rules.

after you read my short tutorial I hope you now curios to know more and more .
if you like plz follow this tutorial  it is good enough to start .

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