what is the difference between an internal and external subset in a DTD
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A Document Type Definition (DTD) is a set of rules that defines the structure and legal elements of an XML document. Oct 29, 2010 ... I have created an HTML5 DTD for use in my PHP XML projects. It ain't beautiful, but it works with well-formed XHTML5 (that is, HTML5 expressed ... The XML Document Type Declaration, commonly known as DTD, is a way to describe XML language precisely. DTDs check vocabulary and validity of the structure of ... This is the DTD file provided with Prime Fulfillment.