XML is a markup language for transporting data. It is available as a free and open format. We will cover the basics of XML, its features, XML validation, and XML editors in this tutorial. Also, we will talk about more complex topics such as XML Namespaces, DTD, XSD, DOM, SAX, and XML Databases. We have included several examples for easy and better understanding of the tutorial. by Deelaka Radheesh Abeygunawardena