XML is a significant markup language mainly intended as a means of representing structured data using a text format. In the language we used in Chapter 4, it can be considered as a means of serializing data structures as a text document. It is used to describe documents such as DocBook and XHTML. It is used in specialized markup languages such as MathML and CML (Chemistry Markup Language). It is used to encode data as SOAP messages for Web Services, and the Web Service can be specified using WSDL (Web Services Description Language).
At the simplest level, XML allows you to define your own tags for use in ...
