XML: An Introduction

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Interested in learning more about XML? Pawan's latest article gives us a brief introduction into XML and its roots.

XML -- eXtensible markup Language -- is an exciting development in web technology. It is the youngest and most comprehensive of markup languages. (Markup refers to anything on a document that adds special meaning to a particular piece of text; for example, bold text is a form of markup). XML got its name Extensible Markup Language from the characteristic that it is not restricted to a fixed set of tags, as is HTML (Hypertext Markup Language). An XML user creates his own tags according to need. A tag is a sequence of characters in a markup language used to provide information, such as formatting specifications, about a document.

Markup languages are roughly classified into three types:

• Stylistic – defines character presentation; for example bold, italics, underline, font etc.
• Structural – defines the structure of the document, such as heading and paragraphs.
• Semantic – informs us about the content of the data, like specifying a title.

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