describe the use of DTDs in defining the structure of XML-based metadata

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May 20, 2009 ... ... XML markup. Because the engine does not use a DTD (Document Type Definition) or SCHEMA, there is nothing to validate against." cynthia. 0 ... Nov 26, 2008 ... [Definition: The XML document type declaration contains or points to markup declarations that provide a grammar for a class of documents. DTD is the most common schema language in use with XML documents. A Document Type Definition consist of a set of rules of the following forms: