Chapter 25, Problem 5RE

Explanation of Solution

XML - Extensible Markup Language

• XML is a language that contains a collection of rules used for encoding the content of a document in a format (human-readable and machine-readable).
• It is used to carry the content of any document.
• The tags are not predefined; and so the programmers can create their own set of tags to describe the data used in the document.
• The elements should have the start tag and its matching end-tag.
• XML is a metalanguage which was established by World Wide Web Consortium.
• It is an extended version of SGML (Standard Generalized Markup Language) that is used to describe more markup languages.
• The DTD describes the structure of a particular XML document.
  • The Document Type Definition (DTD) is an organization specification of an XML document.
• The filename extension is “...