From An Introduction to XML Basic Information Track Computational Science Course CPS616 -- Spring Semester 1999. byNancy McCracken,Ozgur Balsoy, Tom Scavo
Each declaration must follow markup format <!...>, and can only use the one of the following keywords:
ELEMENT (tag definition)
ATTLIST (attribute definitions)
ENTITY (entity definition)
NOTATION (data type notation definition)
Declarations are grouped within a DTD <!DOCTYPE MYDTD [ <!-- The MYDTD appears here --> <!......> ]>