Document Type DeclarationAbbreviated as DTDecl, Document Type Declaration is is a XML system that provides information for a parser to validate XML documents. DTDecl defines the constraints of the logical structure and supports the use of predefined storage units. Declarations also allow a document to communicate meta information to the parser, including attribute values and their types, the names of external files that may be referenced, in addition to some external and non-XML data that may be included.
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