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Document Type Definition
An XML-tagged document or data set is structured, because a set of rules specifies the ordering
and interrelationships of the items in it. The rules define the contexts
in which each tagged item can—and in some cases must—occur.
A file called a document type definition, or DTD, lists every tag element that can appear in the document
or data set, defines the parent-child relationships between the tags,
and specifies other tag characteristics. The same DTD can apply to
many XML documents or data sets.
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