Question

Explain the differences between external and internal dtds.

Answer 1

Internal DTD. Whether you use an external or internal DTD, the actual syntax for the DTD is the same — the same code could just as easily be part of an internal DTD or an external one. The only difference between internal and external is in the way it's declared with DOCTYPE.

Hope this will help you!!!

Answer 2

Internal DTD : You can write rules inside XML document using declaration.

External DTD : You can write rules in a separate file (with .dtd extension).