Question

Document type definition

Answer 1

A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language(SGML, XML, HTML).

Answer 2

A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (SGML, XML, HTML). A Document Type Definition (DTD) defines the legal building blocks of an XML document. It defines the document structure with a list of legal elements and attributes.

mark as brainliest plz