what is ENTITY attribute type in a DTD

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ISO/IEC 19757-9:2008 defines a language that is designed to extend the declarative functionality of an XML Document Type Definition (DTD) to include A document type definition (DTD) is a formal declaration of how an XML document has to be structured. These Guidelines define a large number of elements for marking up documents, all of which are formally defined within the document type declaration (DTD) files ... 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: