Because of the demand for electronic publications, XML is a hot topic for consideration. It seems that everyone is worried about what type of XML he or she should use. There are discussions and meetings focusing on the various XML schemata. Publishers argue over what kind of XML coding they should follow. Frankly, loyalty to an XML schema and its DTD (document type definition) misses the point.
The only reason to select an existing DTD is convenience. Using an extant DTD means that you do not need