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XML is a markup language same as HTML. XML tag you can define your self for storing data. XML store (describe) data, nothing more (either temporary or permanent). XML was designed for describing well formed data. Also XML have some strict rules. That rules follow every XML document.
XML Schema Definition (XSD) language is the current standard schema language for all XML documents and data. On May 2, 2001, the World Wide Web Consortium (W3C) published XSD in its version 1.0 format.The XML Schema definition language (XSD) enables you to define the structure and data types for XML documents.An XML Schema defines the elements, attributes, and data types that conform to the World Wide Web Consortium (W3C) XML Schema Part 1: Structures Recommendation for the XML Schema Definition Language. type definition for elements that can contain attributes and elements. This data type can contain elements and have attributes. In the remainder of this XSD Starter Kit, we will look at how to get started with XSD.