Description of The CTDP XML guide :
This explains the uses, categories, elements, types of XML documents, XML structure, document type definition, element attributes, and extensible stylesheet language. If you write a plain text file, it is composed of simple ASCII characters and nothing more. When a program (such as notepad) is used to display the file, all characters in the text file will be displayed using the same font size, type, and boldness. There are no special display characteristics to this type of file. Markup languages, such as HTML or XML, allow special markup to be embedded with the rest of the text that will enable the program that displays the file to determine how to display the text. In this way, special text like headers may be centered, have a larger and bolder font, or specific display colors may be set. Also additional elements may be added to the file such as bulleted or numbered lists and tables.
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