XML is a widely used markup language used to transfer data between B2B or B2C or any other web applications. Learn the basics of how to create a XML and display , what is a well formed and which tools can be used to view the file. Learn the basics of creating a DTD and Schema(XSD) and validate against XMLfiles. How to install XML notepad to view XML files and validate against Schema files , XSD. DTD and XSD schema files aid in validating a XML file for validity of data rules in XML. Every XML should be well formed. How to create a DTD and use a command line tool on windows to validate against a XML file. How to create a Schema file and validate against a XML file using XML notepad. Learn about different data types in Schema files, how to implement restrictions on data in schema files and how to create corresponding XML files for a given schema(XSD) file. Install XML notepad to display XML files and validate schema files. Examples provide step by step explanation of concepts. XML, DTD and XSD together will help in web development or any applications which require transfer of data between systems or applications.