Tutorial : A Technical Introduction to XML

This introduction to XML presents the Extensible Markup Language at a reasonably technical level for anyone interested in learning more about structured documents. In addition to covering the XML 1.0 Specification, this article outlines related XML specifications, which are evolving. The article is organized in four main sections plus an appendix.

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What is XML?

• What's a Document?

• So XML is Just Like HTML?

• So XML Is Just Like SGML?

• Why XML?

• XML Development Goals

• How Is XML Defined?

• Understanding the Specs

What Do XML Documents Look Like?

• Elements

• Entity References

• Comments

• Processing Instructions

• CDATA Sections

• Document Type Declarations

• Other Markup Issues

Validity

• Well-formed Documents

• Valid Documents

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Courtesy:- Xml.com