Document Type Definition (DTD)s, Schemas & Namespaces

The Document Type Definition (DTD) defines the valid syntax of a class of XML documents. That is, it lists a number of element names, which elements can appear in combination with other ones, what attributes are available for each element type, etc. A DTD uses a different syntax (namely Extended Backus Naur Form) from that used by XML documents.

http://www.perfectxml.com/dtdschns.asp

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