A “Valid” XML document also conforms to a DTD. A “Valid” XML document is a “Well Formed” XML document, which also conforms to the rules of a Document Type Definition (DTD): < ?xml version=”1.0″ encoding=”ISO-8859-1″? > < !DOCTYPE note SYSTEM “InternalNote.dtd” > < note > < to >Tove < /to > < from > Jani [...]

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A DTD defines the legal elements of an XML document. The purpose of a DTD is to define the legal building blocks of an XML document. It defines the document structure with a list of legal elements.

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Errors in XML documents will stop the XML program. The W3C XML specification states that a program should not continue to process an XML document if it finds a validation error. The reason is that XML software should be easy to write, and that all XML documents should be compatible. With HTML it was possible [...]

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XML documents do not carry information about how to display the data. Since XML tags are “invented” by the author of the XML document, browsers do not know if a tag like < table > describes an HTML table or a dining table. Without any information about how to display the data, most browsers will [...]

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