XML Document Type Declaration commonly known as DTD is a way to describe precisely the XML language. DTDs check the validity of, structure and vocabulary of an XML document against the grammatical rules of the appropriate XML language.
This tutorial will teach you basics of DTD. Tutorial contains chapters discussing all the basic components of DTD with suitable examples.
This reference has been prepared for the beginners to help them to understand the basic concepts related to DTD. This tutorial will give you enough understanding on DTD from where you can take yourself to a higher level of expertise.