XML: The Bare Facts

• XML - eXtensible Markup Language
• Reasons for emergence of XML:
  1. Rigidness of HTML
  2. Propritary standard of HTML
• XML separates the content of the document from the layout or design.
• XML gives the developer freedom to create his own tags.
• XML only has syntax. It does not have keywords, programming constructs etc. XML only defines a set of rules that let you structure your XML document.
• Since XML tags are created by the developer, the developer may define what these tag mean using DTD(Data Type Definition) language. But this is purely optional when XML rules have been fully complied with.
• Since XML separates content from design(layout), the developer must specify how a particular XML document displays (in various output devices including browser in PC and cellphone) using another language XSL(eXtensible Stylesheet Language).