Give some examples of XML DTDs or schemas that you have worked with

Give some examples of XML DTDs or schemas that you have worked with?

Answer:

Although XML does not require data to be validated against a DTD, many of the benefits
of using the technology are derived from being able to validate XML documents against
business or technical architecture rules. Polling for the list of DTDs that developers have
worked with provides insight to their general exposure to the technology. The ideal
candidate will have knowledge of several of the commonly used DTDs such as FpML,
DocBook, HRML, and RDF, as well as experience designing a custom DTD for a
particular project where no standard existed.