What is DTD?

Answer Posted / qim2010

The purpose of a DTD is to define the legal building blocks
of an XML document. It defines the document structure with a
list of legal elements. A DTD can be declared inline in your
XML document, or as an external reference.

XML provides an application independent way of sharing data.
With a DTD, independent groups of people can agree to use a
common DTD for interchanging data. Your application can use
a standard DTD to verify that data that you receive from the
outside world is valid. You can also use a DTD to verify
your own data.

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