Question

what is valid XML document mean

Answer 1

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What does a Valid XML document mean?

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$\textbf{XML}$: It stands for $Extensible\: Markup\:Language.$ It was launched in 1996 and a update version of SGML.

$\textbf{Valid XML Document }$ : A valid XML document is a well formed document that contains DTP. The process of making a valid document from well formed document by adding DTP is known as $Validation.$

$\textbf{DTP}$ : $Document \:Type\: Definition$ describes an XML document accurately as it defines the rules and the legal elements and attributes for an XML document.

Answer 2

c the document has a DTD and complomies to it