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Why XML?

The Web today: everything is HTML - HyperText Markup Language.

HTML design:

Example (from this page):
  <h1>Why XML?</h1>
  The Web today: everything is <b><a href="">HTML</a></b> - 
  <i>HyperText Markup Language</i>.

HTML syntax is formally defined (but most HTML is not valid).

CSS (Cascading Style Sheets) allow separation of logical structure and page layout.

But: Although exact layout can be defined separately in CSS, HTML is designed for hypertext - not for information in general!